Thanks for answering. The tank is four months old and doing ok. Nitrate sits at between 2.5 and 5 but I do feed heavily I think. Kh is 12.6 phos is 0.12 ph floats between 8 and 8.2. Stocked with soft corals, a gorgonian, and a bubble tip which split last week. Got a pair of blue cheeked gobies, a pair of clowns, pair of fire fish, three antheas, a copper band, a yellow tang, a box fish and a watchman goby/pistol shrimp. Flow is two Jecod sw 4’s running at about 30 percent. Lighting is a mystery to me. It’s running at uv, v, ry and blue at 115 percent, green and red at 5 percent and white at 46 percent. They are at this intensity for eight hours with a two hour ramp time either side. The lights are the ai26’s x 2. The tank is a Red Sea reefer xl 425. In the sump I’m running a quantum skimmer, an alr1 with a big block of filter brick (can’t remember what it was called) and I’ve recently chucked some K1 Filter media in the return chamber that I had hanging around from my pond. Everything else in the tank is fine. Thanks again, Steve