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Must admit, I've only had it mildly on one set-up. So I don't know about CO2 but this was a high light set-up that unfortunately couldn't get the maintenance it needed when I was sent away unexpectedly. I would suspect high light as the main culprit along with a source of ammonia, either from...

Yep, BGA. As said - if you remove some it smells strongly (I think an earthy type smell) Water change, 72hr blackout & further water change will tackle it.

Thanks, I've got the bar horizontal now to give it a go, plants are obviously being "thrown" about less now. I'll see how we go from here.

I've switched from diffusers to DIY CO2 reactor a short while ago and have started suffering from BBA in a couple of areas in the tank. The way things went, I ended up with a dose of it on the rocks and then it spread to a few plants that had been subjected to the strongest CO2 flow from the...

The main experts will no doubt chime in shortly, but I'd carry out a 50% water change removing as much of the BGA as possible. Don't dose ferts and kill the CO2 & lights, providing a complete blackout of the tank for 3 whole days, then carry out another 50% water change after the blackout. I...