It's a miracle ! I'd had an outbreak of BBA on my branches in my tank. And just now I saw my 4 Denison's circling and biting at it. They dislodged a chunk and one swam up and swallowed it !!!
They cleared a nice section. I'd never heard that they'd eat BBA. I wouldn't have believed it, if I hadn't seen it myself.
FYI I started injected CO2
today, cleaned one of the filters which greatly increased the flow and plan a large WC
I took a vid of it. I'll see if it's useable.