I had blooms of white algae type stuff in my tank, after searching on google, the general opinion was White is bacteria and green is algae. Bacteria is not always bad same as it is not always bad to us. My plecs ate it same way as they do the algae. If you have a good magnifying glass, have a close look, mine looked like white trees blowing in the wind (current) through my small magnifying glass and have now gone after reading on here about over feeding. I was following the advice that came with the food to do it three times a day, as much as they can eat in five mins. I still feed three times a day, but only a third as much as I did. Now no white blooms.
Jon