Thats great to hear all the cautions I almost bought a blue and a yellow sponge today. If sponges aren't such a good idea, what can I put in the lower light areas of my tank, I also have a cave/covered area with nothing in it. I have a 90 gallon with just an inch + of sand in the bottom so the bottom is a good 23 inches from the water surface and I have two 175 watt 10,000 bulbs about 6 inches off the water. Any low light ideas?
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