its about 530 gallons. heres some pics. the socks are 50 the mat is 100 microns. drip plate to bio-balls. there are about 100 qts of bio-balls. in other words that tub is slap full.
Your so broke and u set up a 530 gallon tank??? Lol...start eating instant noodles for a few months and save up for a UV sterilizer and your green water will be fixed.
Take a read on your nitrate levels...check the spectrum of your lights..you don't want full spectrum plant growing light bulbs... Turn you lights off unless you are going to view the fish...if the room is windowless, turn on a room light instead.
A couple of large water changes coupled with the above should solve it for you...