90% water change on my 10 gallon community tank?
Hi guys. Yesterday, I bought a fancy yellow guppy who's name is Lemon and I also bought a Dalmatian Molly who's name is Lady. Before I got them, I had about 10 fish fry from mostly guppies. I took a water sample to Upstate Corals on Jay Street and found out that I had an ammonia and nitrite spike. My nitrates are fine though. So, I did a 90% water change. What's the worst thing that can happen? Is 90% a little bit overboard as far as water changes go? Thanks in advance.