I copied this from a group im in with wonderful axolotl owners! Let me know if you have any questions!
Here is a basic axolotl careguide for prospective owners!
Tank size: 20 gal minimum for one adult axolotl. 10 additional gallons for each additional axolotl. (20 gal long is great for one axie and easily available!
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Prime is the only water conditioner that should be used, as other brands have aloe and other chemicals that axolotls slime coats are very sensitive to.
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Temperature: 58-68 degrees f. 58-65 is ideal. Never higher than 70 degrees f
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Diet: earth worms (nightcrawlers/red wigglers or other varieties.) Repashy: grub pie, or sinking salmon pellets.
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Treats: Ghost shrimp are a great treat. Under no circumstance should you feed any type of mammalian or poultry meat. Bloodworms are also very NON nutritious & addictive and should be avoided. And always remember to quarantine any live food for at least 6 weeks!
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Size: 8-14 inches fully grown
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Lifespan: 10-20 years
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Substrate: bare bottom or sand. Absolutely no gravel or rocks. Gravel and rocks smaller than approx 2x your adult axies head pose a choking and Impaction risk.
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Filtration: low flow or sponge filters are preferred. There are tricks to slow down flow, if you need some ideas, just ask!
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Tank mates: species only! Cannot be kept with other fish or amphibians. Axolotls housed together much be of the same head size or they will cannibalize each other. Males and females should not be housed unless breeding
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Other considerations: how to complete the nitrogen cycle before you get your lotl. How to effectively cool your tank in summer or in case of a power outtage. Purchase a liquid aquarium test kit to monitor parameters and schedule appropriate water changes. Exotic vet and medication.
Have you learned about the nitrogen cycle? Basically, the nitrogen cycle is the process in which bacteria that live in your filter break down harmful and toxic chemicals produced by your Axolotls gills, poop, food and plants (if you have them) and turn them into less toxic chemicals.
Ammonia is the first stage of this cycle. Ammonia is created by organic waste breaking down in your tank as well as produced as a byproduct by your Axolotls gills. Ammonia is toxic and harmful at any level present in your tank.
A bacteria called Nitrosonoma eats ammonia and converts it to nitrite which is equally harmful and toxic at all levels in your aquarium. This bacteria needs time to grow and culture in your filter. With ammonia present at 2-4ppm I typically takes around 2-4 weeks.
The next stage is nitrite. A bacteria called Nitrobacter eats nitrite and converts it into nitrate which is not toxic or harmful at levels below 40ppm for fish and 20ppm for amphibians. It takes about another 2-4 weeks for this bacteria to culture after nitrite begins to build in your tank.
Once both of these bacteria are successfully cultured, you should be able to read 0 ammonia, 0 nitrite and 5ppm or more of nitrate. It should also be able to successfully convert 4ppm of ammonia within 24 hours. The whole process can take 4-8 weeks.