Ellenquacker72
Aquarium Advice Freak
I've been having a problem with this algae. It's in a 20g H ph 8.3 and hard water. Lighting: single t5h0 10000k bulb. About a month back I took all the rocks out and scrubbed it all off but within a couple days it came right back green and slimey, and now it's quite thick and slightly spongy. It's really frustrating since it builds up on (everything including the sand) so everything looks really dirty and covers the glass in a couple days. When I take the rocks out they have a distinct earthish smell. Could it be Cyanobacteria? My tanks been set up for 2.5 years but I've never had any significant nitrates, usually less than 5ppm (according to my API master test kit) Is there any way for me to fix this?