Hrm. The BGA is back with a vengance, and it's puzzling me.
See the photo? The next morning, the wood had a big thick layer on it (primarily where I'd just attatched new moss). Some forming around the substrate too. Currently all over the moss.
So, why? Looking at the pinned topics, possible causes given as-
Often caused by very low nitrates- Well. Possibly? I dunno. Bioload is pretty low at the moment, plus with all that moss...
Dirty substrates and filters may also bring it on- it shouldn't be dirty...
Poor water circulation is another possible cause- Perhaps. But I do have a U3 in there, which isn't exactly miniature.
Excess organic loading is the real cause in many cases- Erm... Not AFAIK...
I admit I've been a bit lax with the carbon lately, but since it appeared even before then, I wouldn't put that down as a real factor.
Well, anyway. Assuming I'm not being abandoned by parents over the weekend, I'll possibly try a different shop for fish.