Unfortunately, I am not offering any solutions, just joining the club of algae growers and fighters.
Your advices are welcome - I have pretty much scanned the threads on solutions, applying some, but still suffering big time:
Tank:
150x50x50cm, i.e. 375 L (100g), some 340L of water volume
Light: 4x80W T5 with individual reflectors, 2xGiesemann Midday + 2 x Sylvania GroLux, 10h/day. I have a glass top on the tank, which reduces the intensity to some extent.
Filtration: Tetratec 1200
Pressurised CO2, 5 bps, Ferplast diffusor. Dropchecker is green. C02 is on 24h/day, at night I turn on air pump.
Substrate: 1-3mm gravel + Tetra substrate, Dennerle tabs (Iron, nutriballs...)
1 600 L/h pump for circulation and water distribution
Water: pH 7, kH 8, GH 11
Medium plant and fish mass.
WC 2xweek 15%
PPS daily dosing Macro + Micro
Now,
I grow BBA, esp. on microswords, and in the part of the tank where there is the diffusor and increased water circulation. I used Easy Carbo before, but my HM does not like it at all, it basically turns transparent and dies, then it takes 2 weeks to recover. I understand BBA is related to CO2 level (being too small), but I don not understand it's strongest in the part of the tank where CO2 is at its peak. Interestingly, explosion occured when I dug up and removed some 20-30 cryptos, thereby disturbing the substrate substantially, as well as changed the direction of filter outflow pipe (to downwords)
2) GDA - it's on glass, and as usual, as soon as I wipe it off, it comes back again. Now I am growing it too, on advice I read here (Tom Barr recipe), now in week 2, before I remove it again once it has matured. What bugs me more then it being on glass is GDA on plants, esp. on Alternathera, and pretty much anything that's medium or slow growing. It managed to attach itself even on Ludwigia R. Rubin, which grows like weed (but not on HM or Micranthemum U).
My water parameters are all in check.
I reduced the light to 7 h/day, to slow it down - what I find as a paradox is that GDA likes high light, so according to some I should reduce it. On the other hand, most of my plants like high light as well, so if I reduce it even more, I can expect some plants to start slowly dying. I used to have T8 before, without reflectors, and with some species growing now I have failed miserably before.
Plants are pearling, but these algae are really pita. I am tempted to add some algicide, but this will be only short term solution. With lower lights (T8), without dosing macros, everything was OK, though slow growing, never had to clean the glass.
Your advice and guidance is highly appreciated.