Everything in my tank is doing just fine or better, EXCEPT this maze colony, and a frag of the same, or very similar type of brain, which are slowly dying back. The rest of them looks fine, but they’ve been receding for a couple weeks now(thankfully very slowly). I actually had another small colony of a different type of maze, die the same way, just prior to this. I have other brains, and even maze brain drags that r still doing just fine. The 2 currently affected aren’t in the same spot. I did a dip very early on, but there didn’t seem to be any difference, so I haven’t done any since. Does anyone have any thoughts on how to help my little guy?