I have another beginner question. I have not found any rules as to what is considered a high nitrate level. All I've read is if it's too high, it can contribute to algae growth and poor fish health. Does it depend on the fish you have? Right now, I'm between 5 to 10 ppm and the tank (10 gallon) has white clouds, x-ray tetras, and peppered corys. I am using a liquid test put out by Aquarium Pharmaceuticals so I'm assuming it's pretty accurate. The test card goes up to 160 ppm so I guess my level is low? Also, is it true that weekly partial WCs can control the nitrate level? Thanks for any help!