Well I tried to post a pic of my problem but my phone wont let me ;( so I have had no fish in my tank for about a week now, they died. I am trying to have a good healthy tank to put some happy healthy fish in! My tank never grew ANYTHING in it when it had fish, now just a couple days after the fish are gone, I put in a few shiny black rocks, the rocks are now growing fuzzy white stuff. I dont know if this is good or bad. The tank got poisoned by my son, the fish died within a few days, I did water changes immediately, but havent done one since the last fish died. So I left some food n poop in there hoping thst would help not loose my cycle. So maybe that was a bad idea? Yeah, I dont know what im doing, please help me!! Thanks.