I've been having trouble with my anubias barteri. I bought 2 rhizomes tied to driftwood about 2 months ago. Since then, only 1 rhizome has shown any signs of growth (putting out 1 leaf). The other has started to brown at the centre, and leaves have fallen off where the rhizome has begun to rot.
I meant to take some photographs but I was forced to cut off the brown parts for fear of the rotten area spreading. I have narrowed the cause down to three possibilities:
1. Water current. The rhizome that rotted was relatively closer to the powerhead that circulates water around the tank.
2. Water parameters. The water in the aquarium is slightly acidic and likely soft, since blackwater treatment was added to cater to the cardinal tetras that live in it.
3. Insufficient nutrients. I do not add in any fertilisers to my tank at present, so some people suggested it was a lack of iron etc.
Does anybody have experience with similar problems, and would you care to share your solutions? Any help would be appreciated, it's such a shame to see a good plant go to waste.