Well this is mysterious because that looks like BGA and that could only happen if you have a shortage of nitrate. What have you been dosing over the past couple of weeks prior to getting the ferts yesterday? and especially the 3 days prior when you did the water changes?hixy said:hello ceg4048,i did as you said i have done 2 50% water changes in 3 days got dry ferts yesterday and added 1 tsp KNO3, 1/4 tsp of KH2PO4,2 tsp epsom salts and tonight added 1/4 tsp of trace element.doing a 50% water change is no mean feet when have to carry water in buckets from garage ha ha.you said add epsom salts when i change water. is that every time .here are algae pics.the red plant in the middle looks like its grown to inches in a day even though its covered with algae.
beeky said:BGA grows very fast when it gets a hold, but it doesn't spring from nothing overnight. I suspect that it was there before but only became noticeable overnight.
Low nitrates maybe right but IME the presence of BGA is due to poor filtration (this may lead to a drop in nitrates due to the inefficient break down of ammonia), although once it's there it's tricky to get rid of. The only thing that worked for me was continual cleaning and water changes every day for a week and then a 3 day black out followed by another few days of water changes.