I went on vacation for five days and payed a teenage neighbor to take care of my tanks. In my older, very stable tank: 3 dead Het Rasbora 1 dead Oto Lost some CRS AND THIS in my new tank: Anyone have any clue what this is? It is all over my tank. Specs: 2 x 22in. T5HO 6500k 7 times/hour water turnover DIY CO2 20 gal. 40gal. rated powerhead Glosso Rot. Nanjenshen Marsilea Vareigated baby tears Thanks!