My tank was overstocked; I had a powder blue tang and blue hippo in a 40 gallon. My nitrates were at like 40, then when I took them out (the tang police let me go), my nitrates went down to zero in about 2 weeks. Then Hair Algae started growing everywhere. I also got an outbreak of cyano. I think my tang was eating it so it never took over. I got rid of 90% of it but there are still bits and pieces here and there. I just added a skimmer. I just added two turbo snails and three trochus snails. I get my water from raley's and according to my TDS meter, it is anywhere between .003-.006. Will it eventually just die off? Will shortening my photoperiod work?