HI everyone, \n \nSo I've had my tank set up for about 4 months and have had nothing but battling alage since the start. I am quite frustrated, as i feel ive done everything that everyone's mentioned. Nontheless, i am posting once again with an update to see if i am missing anything...I am currently battling cyano bacteria bloom all of the sand...\n \nHere's my specs: aquaclear filter containing phosphoguard and fresh active carbon, protein skimmer, 2 power heads -one at the top of the tank and one at the bottom on oppsoite sides, i feed every other day frozen food, bulbs are pc's only 4 months old and 1 is on for 4 hours a day and 1 is on for 6 hours a day, overlapping. I use RO water, the nitrate is 0, ph 8.0. I have been doing 4.5 gallon water changes once a week for 3 weeks now.\n \nThe only single thing i can think of that has changed is my brand of salt. I used to use oceanic (love it!) but when i went to the lfs last time they only had red sea in stock so i got that. I mixed what was left over of the oceanic in with the red sea....so if the change in salt mix is a problem...then i really can't fix it, i guess.\n \nHave i missed anything? Let me know what you all think. Thank you!