Silicone inside the edges of the Tank.

Yes it is possible to have too much lighting for example my LEDs are at 65% for blues and 55-60% for my colors if I turned them up to 100% Some corals would not open and others would get burned.

Omg that explains alot. I had sun polyps and they started to get discolored and I didn't know why :( I'm still fairly new because that was years ago. So what's 65 % for blues and 55-60 % for my colors mean?? And how can do that
 
Omg that explains alot. I had sun polyps and they started to get discolored and I didn't know why :( I'm still fairly new because that was years ago. So what's 65 % for blues and 55-60 % for my colors mean?? And how can do that
On the better led fixtures you can dim the channels and control how bright your fixture is. You would have to get a fixture that is dimable
 
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