Dear friends, please, is this BGA? If yes, which kind? And how to fight against it?
I tried to find out exactly what king of algae or BGA it is, but I was not successful.
Some people told me it is BGA, but all pictures of BGA I have found are different. This algae does not smell, you can remove it by vacuuming. I looks that it does not grow on plants or on any surface like algae, but only floats and catches in plants like Egeria, Riccie ...

I do everything - bottom is clean, regular water changes, filter cleaning ...

Water parameters are:
Tank: 125 liters (33 galons)
CO2: yeasts
pH: 6,7-6,8
kH: 6-7
gH: 12
Fe: about 0,5 mg/l
PO4: 0
NO2: 0
NO3: 10 - 15
NH3/NH4: 0
Lightning - 2x 28W Day and 28W Natura

Sorry for my English. It is not my native language and I have not spoken very long time :-)

Thank you very much for your help.

Karel