Apple snails and nerites will be OK together, but if the apple snails are doing the job you don't need to add nerites. You may not have enough algae for both species together
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Zebra danios are very active and require a bigger tank size than a 22g has to offer, unless the tank has a very long base. What are the dimensions?Ok, I won't get a fish for algae eating. Instead I'll just get a school of zebra fish when I return the cae because I feel like I need something that stays at the top of my tank.
My parametersWhat else is in your tank? How hard is your water? How is your tank set up? There are lots of relatively sedate upper level fish.
I'm not entirely sure of my gh...You haven't given the hardness of your water - that's GH. We need to keep fish which need the same hardness as our water. For example, so far you have all soft water fish but if you have hard water they won't live as long as they should and hard water fish would be a better option.
You can go onto your water provider's site and they usually tell you in the water quality testsI'm not entirely sure of my gh...
My gh is around 10 currentlyYou haven't given the hardness of your water - that's GH. We need to keep fish which need the same hardness as our water. For example, so far you have all soft water fish but if you have hard water they won't live as long as they should and hard water fish would be a better option.