Wow you have my sympathy!
Looks like a runaway case of cyanobacteria, of the 'cotton candy' vairety. The 300+ hours of light certainly won't have helped. You might want to start with a blackout period of two or three days and vacuuming out what you can before and after. Water changes and your biopellets should help bring nitrates back to acceptable levels. That and a lot of patience. I used to have a nasty plague of cyano and dinos but got through it. There is light at the end of the tunnel.
Good luck!
Graeme
|