Originally Posted by Gymmic
I have found multiple test kits in his possession. What should I test, everything?
I applaud your willingness to take on this tank with so much to learn.
Start by testing for ammonia, nitrite and nitrate. Ammo and nitrites should always be zero. If they're not, then a PWC
needs to be done because those 2 things can quickly kill fish. The nitrates should ideally be as close to zero as possible to help cut down on algae, but anything over 40ppm is dangerous to fish, so a PWC
would be in order if its that high. BTW, if its an API test kit you're using, divide the nitrate result by 4 to get the actual result.
Later, you'll need to test for calcium, magnesium, pH, alkalinity. But first check the basics and get the algae under control, then worry about the advanced stuff later.