I usually just let my long tank do whatever it wants. There have been funky algae blooms and funguses popping up from time to time, but it all seems to balance out eventually. Some of the funky muck has fallen off this driftwood and revealed an amazingly beautiful velvety green fungus. At least, I’m assuming it is a fungus, it could be a fine algae of some kind, or moss even. I have not yet taken the time to attempt to identify it.
In case you missed it, here’s the aquarium I’m looking at.