Water testing
Open result Freshwater Aquarium Water Testing Guide
A practical, repeatable process for reading pH, ammonia, nitrite, nitrate, KH, and GH with better context.
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29 results
Testing tools
Open result Aquarium water-testing tools
Keep freshwater test tubes stable and aligned with the comparison chart using Simply Submerged Aquatics tools.
Aquarium guides
Open result Freshwater aquarium guides
Browse practical guides about fish health, water testing, aquarium records, compatibility, and privacy.
Aquarium safety
Open result How to Cool a Freshwater Aquarium Safely During a Heatwave
A practical heat-response plan: verify the temperature, protect oxygen, reduce heat input, cool gradually, and record what changed.
Healthy fish buying guide
Open result How to Choose Healthy Freshwater Angelfish, White Cloud Mountain Minnow & 8 More Aquarium Fish
A reviewed store-side health guide for Freshwater Angelfish, White Cloud Mountain Minnow, Chili Rasbora, Glass Catfish, Threadfin Rainbowfish, Ryukin Goldfish, Gold Laser Corydoras, Demasoni Cichlid, Banjo Catfish, Rainbow Shiner. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Aquarium tool
Open result Freshwater fish compatibility checker
Compare a proposed fish with aquarium volume, water, current livestock, social needs, and adult size.
Aquarium records
Open result How to Record Aquarium Water Test Results
A number without a tank, time, unit, or method quickly loses meaning. Use a simple record that remains useful later.
TankWise
Open result TankWise freshwater aquarium app
Download the free Android app and keep your aquarium, water, livestock, and fish decisions together.
Team profile
Open result Dan
Dan has 40 years of freshwater aquarium experience and keeps the team's planted display aquarium built into cherry cabinetry.
Guide collection
Open result Healthy freshwater fish buying guides
Find reviewed store-side checks for healthy appearance, warning signs, temperament, and normal fish behaviour.
TankWise app
Open result Save your aquarium context with TankWise
See how TankWise records tanks, water, livestock, plants, and candidate-fish comparisons.
Team profile
Open result Simon
Simon has 15 years of freshwater aquarium experience and keeps the team's 220-gallon planted aquarium.
Aquarium cycling
Open result Fishless Aquarium Cycle Stalled? Use This Test-by-Test Decision Tree
A fishless cycle is not proven by a calendar. Use the pattern in ammonia, nitrite, nitrate, pH, and recent tank changes to decide whether to wait, verify, or correct the setup.
Aquarium app guide
Open result A Simple Aquarium App for Better Fish-Store Decisions
A healthy-looking fish can still be wrong for your aquarium. Use one focused workflow to assess the fish in front of you and compare the species with the tank you already own.
Aquarium app guide
Open result Best Aquarium App With No Subscription? Meet TankWise
A practical way to compare subscription-free aquarium apps, including what TankWise gives one tank for free, what the one-time unlock covers, and where the app has limits.
Healthy fish buying guide
Open result How to Choose Healthy Betta, Goldfish & 8 More Aquarium Fish
A store-side health check for Betta, common and comet Goldfish, Glowlight Tetra, Clown Pleco, Odessa Barb, Weather Loach, Flowerhorn, Electric Yellow Lab, Dwarf Synodontis, and Emerald Dwarf Rasbora.
Healthy fish buying guide
Open result How to Choose Healthy Bristlenose Pleco, Endler's Livebearer & 8 More Aquarium Fish
A reviewed store-side health guide for Bristlenose Pleco, Endler's Livebearer, Three-spot Gourami, Bloodfin Tetra, Clown Killifish, Elephantnose Fish, Salvini Cichlid, Blue Peacock Cichlid, Bleeding Heart Tetra, Parkinson's Rainbowfish. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Healthy fish buying guide
Open result How to Choose Healthy Bronze or Albino Corydoras, Pearl Gourami & 8 More Aquarium Fish
A reviewed store-side health guide for Bronze or Albino Corydoras, Pearl Gourami, Bolivian Ram, Buenos Aires Tetra, Japanese Ricefish or Medaka, Ropefish, Redhook Silver Dollar, Johanni Cichlid, Redtail Catfish, Red Rainbowfish. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Healthy fish buying guide
Open result How to Choose Healthy Cherry Barb, Common Pleco & 8 More Aquarium Fish
A reviewed store-side health guide for Cherry Barb, Common Pleco, Yoyo Loach, Pristella or X-ray Tetra, Chocolate Gourami, African Leaf Fish, Red-head Tapajos Eartheater, Compressor Cichlid, Red Phantom Tetra, Agassiz's Dwarf Cichlid. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Healthy fish buying guide
Open result How to Choose Healthy Common Molly, Brilliant Rummy-nose Tetra & 8 More Aquarium Fish
A reviewed store-side health guide for Common Molly, Brilliant Rummy-nose Tetra, Pearl Danio, Upside-down Catfish, Spotted Blue-eye, Skunk Loach, Texas Cichlid, Kenyi Cichlid, Spotted Raphael Catfish, Western Mosquitofish. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Healthy fish buying guide
Open result How to Choose Healthy Discus, Black Neon Tetra & 8 More Aquarium Fish
A reviewed store-side health guide for Discus, Black Neon Tetra, Bala Shark, Penguin Tetra, Dwarf Chain Loach, Clown Knifefish, Marbled Hatchetfish, Jewel Cichlid, Scissortail Rasbora, Glowlight Danio. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Healthy fish buying guide
Open result How to Choose Healthy Dwarf Gourami, Convict Cichlid & 8 More Aquarium Fish
A reviewed store-side health guide for Dwarf Gourami, Convict Cichlid, Chinese Algae Eater, Black Phantom Tetra, Zebra Loach, Red-eye Red-tail Puffer, Dwarf Pencilfish, Frontosa, Rosy Tetra, African Butterfly Cichlid. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Healthy fish buying guide
Open result How to Choose Healthy Fancy Goldfish, Boesemani Rainbowfish & 8 More Aquarium Fish
A reviewed store-side health guide for Fancy Goldfish, Boesemani Rainbowfish, Green Neon Tetra, Rubberlip Pleco, Golden Wonder Killifish, Panda Garra, Green Terror Cichlid, Auratus Cichlid, Asian Stone Catfish, Neon Green Rasbora. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Healthy fish buying guide
Open result How to Choose Healthy Guppy, Black Skirt Tetra & 8 More Aquarium Fish
A reviewed store-side health guide for Guppy, Black Skirt Tetra, Pygmy Corydoras, Common Otocinclus, Roseline Shark or Denison Barb, Ranchu Goldfish, Jack Dempsey Cichlid, Cobalt Blue Zebra Cichlid, Bumblebee Catfish, Exclamation-point Rasbora. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Healthy fish buying guide
Open result How to Choose Healthy Neon Tetras, Panda Corydoras & 8 More Aquarium Fish
A reviewed store-side health check for Neon Tetra, Panda Corydoras, Lambchop Rasbora, Black Ghost Knifefish, Black Ruby Barb, Oranda, Blood Parrot, Red Zebra, Featherfin Squeaker, and Phoenix Rasbora.
Healthy fish buying guide
Open result How to Choose Healthy Swordtail, Celestial Pearl Danio & 8 More Aquarium Fish
A reviewed store-side health guide for Swordtail, Celestial Pearl Danio, Cockatoo Dwarf Cichlid, Three-stripe Corydoras, Dwarf Neon Rainbowfish, African Butterflyfish, Silver Hatchetfish, Maingano Cichlid, Iridescent Shark Catfish, Turquoise Rainbowfish. Photographs appear only when a suitable exact-species aquarium image and reuse record are available.
Fish compatibility
Open result Why Fish Compatibility Needs Your Tank's Context
A species label cannot describe the aquarium you own. Learn which tank details make a compatibility comparison more meaningful.
Trust and privacy
Open result Why TankWise Is Not an AI-Powered Aquarium App
TankWise deliberately puts explainable decisions and local aquarium data ahead of an AI label. Here is what that means for your trust and control.
Team profile
Open result Alexandra (Allie)
Alexandra, known as Allie, has 5 years of aquarium experience with planted cherry shrimp tanks and helps test TankWise workflows.