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Hi All thanks for the advice so far. The salinity level is 1.026, I dont know the exact readings for the nit/phos etc I will get the water tested at the weekend and get the numbers. But I remember the last time I did which was last weekend I was told the nitrate was 0, does that make sense...

Hi I have had my tank for just over 1 year and everything was fine, but over the last 2 months my corals have retracted. I do the normal maintenance things ie water change every 2 weeks, regualr water tests (also perfect). Others things have started to grow in the tank that I havent put in...

Its 35litres, just a small one

Should I upgrade to a more powerful light then? if so what would you recommend? Thanks

Its an orca all in tank, the lights used are two 18 Watt Fluorescent PLS light tubes one blue one white.

Hi All & anyone, Just a general question, to maintain healthy corals (SPS) should I routinely change my light? its just that recently the flowers have shrunk, nothing has changed in the set up and all water tests are ok. I know in my freshwater tank I should change the light annually to allow...