Suspended Algae Problem!

[linzld]

It has basically been dark since Monday night but I actually wrapped it in Tinfoil at 5 am on Tuesday. So it has been dark about 60 hours now. I peeked inside the evening and it is crystal clear but I'm still afraid of it coming back... might leave it dark until tomorrow evening.

My refugium is about 3 gal and I don't have a sump. Hard to tell how fast cheato is growing because I just got new stuff to replace the stuff I killed. I have 2X9W compact flourescents over it and they are on the same light timer as my tank. This whole problem (starting with the cyano) seems to have kicked off when it started getting nice this spring, around May. Although my tank isn't that close to a window, our house recieves lots of natural light in the summer. I have shut the blinds in the living room and covered the side of the tank facing the window with heavy, dark paper.