i think i have a hair algae problem starting in my tank, but i'm not really sure. Most of my plants have this long thin light green almost grey stringy stuff hanging off of their leaves just blowing in the current. some of the stuff is short while some is almost 2 or 3 inches long. i don't know whats causing it much less how to get rid of it. I recently decreased my light time from 10 hrs a day to 8 hrs a day when i noticed the hair and green spot algae starting to grow. I have 4-54 watt t5ho lights over a 75 gallon for a total of 2.88 wpg. i run two bulbs from 3pm-4pm then the other two kick on and all four bulbs are lit from 4pm-10pm then only two bulbs from 10pm-11pm. co2 (5 bps) comes on at 2pm till 10pm. lights and co2 are on a timer. i dose KH2PO4 with KNO3 on Mon. Wed. Fri. (60ML total each day) i dose PMDD Tues. Thurs. Sat. (2X 1/4 tsp each day). 25 to 50% water changes on Fri...dose nothing on sunday. I have 80 pounds of eco-complete substrate, one marineland c-360 canister filter and attached to that is a 45 watt uv sterilizer. i have no heater and the tank stays constant at 80F. i only have one power head inside of the tank, but water circulation seems to be pretty good. the tank itself has been setup for 6 months, but was just water and the substrate and the driftwood for the first 5 months..just within the past month did i add plants and fish. im pretty sure i over stocked it too fast and overloaded the system, which is probably a big cause..I am not sure if I am dosing enough though..what do you think?