100w

i bought a eheim jager 100w for my new tank. For some reason the dial doesnt go above 83 degrees and the box clearly states it can go up to 93 degrees. My water has been heating up at 83 degrees for a good 24 hours and my water temperature is only at 73-74 degrees. The ambient air temp in my...

Hey, I just added a Tek light 4 bulbs on my 30g and I was wondering what kind of timing on the lights. I googled it but theres not a lot on it. I know the standard is to run actiniks around an hour before the whites. But the question is why. Does it really have an effect on the corals if the...