So I see a few things that could cause the hair algae. Weak flow, too much light, and too little CO2. I would turn up the flow of the CO2 a little bit (if you have a drop checker it would help you know where you stand), reduce the photoperiod to 8 hours, and get a filter with more flow.
Chugging along... finally have the rest of plants and algae getting in check. Upped co2 from .5bps to 2bps. Fish are fine and algae is slowly going away while my glosso has started to grow again. Once I get tripod I will continue with weekly photos to log the growth over x amount of time. Also will be adding 7 neon tetras tomorrow.
When Rotala grows sideways it's usually because of too much light. However, it's not a big problem, just keep up with your trimmings and you should have a nice thick bush in no time!
Good luck, I can't wait to see how this one turns out!