I was lucky enough to be given a couple of these yesterday and what I didn't realise is that they generally feed using a fan system, filtering debris our of the water. They do however seem to be happy enough eating debris from the gravel. I was wondering, after doing some reading I think I would like to provide a current for them to feed more naturally, but I'm worried about my planting etc. Any suggestions on how to create a current low down in the aquarium but not too strong? One thought was to maybe mount a spray bar vertically in one of the corners. Thoughts?