Just wondered if anyone has experienced white fuzzy stuff kinda looks like it comes from a single spider thread then multiplies realy small each only being about 1mm Ive cleaned my acrylic and just done a 35% water change and within minutes it was covered again. My tank is planted and I went to the local waterfall to pick out my roc k2 large peices of sandstone make up the lagest cave could it be something from the sandstone? I'm clueless be thankful for any suggestions. One more question I picked up 6 Dovii's all about 3 in. from pet soulutions and three of them were perfect but the other 3 have severe split fin. The fins almost look as if they are getting better but they are were it appears the fins are healing changing to a weird off white collor. THank David