I recently added a good sized chunk of mopani driftwood to my tank and attached an annubias nana(i think) and annubias barterri(once again...I think). The nana seems to be doing fine but the barterri isn't doing so well. The leaves appear to be falling apart and it is yellowing quite a bit. I don't dose this tank...yet. But if its a nutrient issue then I may start. However, I thought annubias weren't very nutrient demanding?