ok so looks like the osmolator wasn't stuffed, was the sump issue causing the problem, this is fixed now, osmolator has run 2 days with no issues.
Now, tank is back to being fully happy again, still the odd coral sulking but thats no drama, they will come good.
So now I want to concentate on really getting the colours out, I am very cautrious of using zeovit as if I go away they tank may crash, any other suggestions to get a really good coral colour?
Current stock
6-7 hammers
3 torches
4 cats
morphs
few rics
trachy
duncan
goni
leathers