Tank looks good, but believe me, the hair algae may look kinda cool at first, but it won't when it covers everything in the tank and makes the water into a smelly green soup. Best to take care of it early IMHO. Hair algae isn't something that one can keep just a little of and have it under control.
I have some blue leg and red leg hermits in there and couple bumble bee snails and a couple turbo snails. All together I have about 15-20 hermits. Would that do fine ? If it starts to spread and see that my hremits cant keep up should I just pull it out ?