Sounds like a good idea, but I haven't ever heard of using shrimp pellets either. I've heard of rodent poop. If it is a hygrophilla, I belive they are not very heavy root feeders, so it might not be necisary. Its definately not ancharis though, I can tell you that much! Actually, ignore what I asked before, because it is a new plant so it's probably still adjusting so health probably isn't a huge problem at this point.