My coral is dying

[tystxne1]

I used new media and the metal halide bulb was changed about 6 months ago, but I have never changed the T5. Do you think it would be a bad idea to put the corals into the 120g. When I get home tonight I will take a picture of the tank and post it so you will have a better idea of what the brown algae looks like. It is almost stringy and hangs off of the corals and just today has started to cover pretty much the entire sand bed. Sorry it's just so frustrating to not know what is wrong with the tank, I just want to fix it.

[Mr Cob]

sounds like your system is going through a cycle as already mentioned. You could move the corals to the 120...is it suitable for corals though? Lighting, flow, salinity etc...no coral eaters?

[tystxne1]

The tank should be fine, but I only have florescent and t5s on that tank, so I thought I might just switch the lights around on the tanks and I don't think I will be able to move my shrimp over because I am scared that the eel will eat them, but other then that I think the 120 gallon tank will be fine. To be honest The 120 gallon tank has better flow then the 70g because the 70g is a bow front and can be a nightmare to get the flow set up correctly.