Algae help

[Bonnie]

I have a 40breeder that's been running about 7 months now. There are 6 Rasbora Espei,6 psudomugil Iriani Reds,7 punctatus cory's(never seen) and 4 pygmeous cory's. It sounds like alot but they hardly take up any room in the tank. Also I now have alot of ramshead snails- thank you-due to a plant purchase I made, there must have been eggs on the leaves I just didn't notice. No Ammonia, PH is 6.4-6.8, nitrate-5.0ppm and nitrite 0. there is low lighting in this tank
maybe 1.25 watts per gallon, just some mosses and low light plants,anubias, sunset hygrow,crypts.
About a month ago I started noticing some hairy stuff on moss, long and flowing,not the short tufts that sometimes grows on plants etc. Am I doing something wrong? How do I get rid of this? I usually
clean the tanks once a week, however during the summer more like every 2 weeks. Any help would be
great, thanks.