Is Rotala Rotundfolia suitable for low tech?
I've got a 10g tank with play sand substrate planted with cryps, java fern, valisineria and rotala rotundfolia. I'm using a DIY CO2 bottle that produces about 21 BPM and is diffused directly into the intake of my HOB filter which expels a fine mist of bubbles from the overflow. I have a 15w 7800k lamp on the tank but it's pretty old, it may only be putting out 10w or less. Everything seems to be doing well, the crypts have more than doubled in size in just a couple weeks, the java fern is sending out plantlets on several leaves and the val grows a few inches each week, even the rotala is growing a couple inches a week, but the new growth doesn't look as healthy as the old growth, the leaves are more transparent and show more pink than red or green. I just started fertilizing with some Jungle brand root tabs (which are probablly junk but they were given to me) The package says 0-0-6 with 4% iron.
I got the rotala from another member of the local fish club who had been growing it in a similar low tech tank, I'm not sure what I could be doing wrong. All other plants seem to be doing well, the only think I can think of is more light or maybe more iron. Any ideas from the pros?