that's probably true about the flow (that it isn't very good), but I've been having algae in those areas since before I put the plants in. I don't think that the plants themselves are obstructing the water... I might turn the pump nozzle downwards at least, I think it's pointed up / towards the back right now. and you know, i actually get pretty decent growth I guess, but only if the plants are above two thirds up. there were some that were doing pretty good until I cut them down and replanted them, they haven't grown at all since then basically. blahh.
I'll lower the photo period again and look over my ferts. Thanks!