Well I'm back and sorry to say the red cyno and brown ditoms are still on my sand , been carbon dosing with brightwell bio fuel , vibrant, coral snow no change tank parameters as follows sg 1.026,PH 8.1, CAL 460 ,Alk 8.0 ,Phos 0.00 - Hanna checker, Mg 1500, Nitrates 10ppm temp 78% TDS 0 last water change on 5/7 40gal next one due in two days 265gl tank 90gal sump 30gal refugim total water volume 350gal feed 1/4 sheet of nori two cubes of mysies 4 powers plus the 2 returns fish 4 tangs 4 cormis 2 anthias , 1 bangi 1 mandran 1 6 line 1 leopard wrasses 1 red hawk 1 blenny , run rowa phos, black diamond carbon MRC double Beckett injection skimmer system cleaned 3 times a week dose 2part plus kallwasser lights are reefbreeders 9in above the water line on from 1pm - 12am ramping up and down full power is only 4 hrs plenty of snails , crabs , two green brittle stars what am i missing