[rlcline76]

I hate wasting away.
A couple of things you probably already know...you can try placing it elsewhere different lighting and/or flow.
If you have any parameters out of whack, this might be a good time to correct what you can.
If you see any browning (almost like diatoms) we might be talking fungal, you can try dipping the colony in Furan 2 and vitamin C and possibly trimming infected areas away...