so i've had a 10 gal brackish set up for a few months now. I've been having a nasty algae issue for a few months. I've taken everything outta the tank. I've tried everything... more flow, less light, low grade and high grade phosphate remover and changing out the sand completely... it keeps comming back. I test my water and have has 2 LFS test it... they said everything is where it should be... any suggestions?