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i think at 7 inches you'll be ok. I have two fuges going right now once light at 9" at the moment and the other at 4". The same water going through both. The the chaeto under the light at 4" inches is almost yellow with just a tint of green. The chaeto at 9" looks much healthier and more of a medium green. The chaeto under the 4" is still growing though, it just looks like it's dieing. I only use the 20 watt bulbs though so I'm guessing if I was using the 26 watt bulb at 4" it would look even worse or die off.
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