Betta Fish Bowls, Habitats, and Accessories
I have a 20 gallon long tank and last week I got 6 cories, 6 rasboras, and my betta to go in it. I tested the ammonia everyday and it is at 0, but today I tested the nitrates and they were close to 90! I'm going to do a major water change today to bring them down.
Before I added the fish the...