I have a 2 feet tank, filtration system is overflow, I have 3 small blue tangs, 1 clean shrimp and 2 true percular clown with 7kg live rock and Hawaii black live sand. I understand my tank are overload with fishes, I facing problem like nitrate too high, that why brown algae keep growing. I have a skimz BR80 bio reactor to assist me to reduce the NO3 in my tank. I also reduce the light duration to 6 hrs. I do water change every 3 to 4 days to reduce nitrate. I wish to have some advice on powerful skimmer that can do me a good job in keeping my NO3 low. I also add Continnum aquatics coraline purple.Cx to accelerator for coraline algae grown. Please advice which skimmer I should purchase and where to purchase. Thanks for advise.