01-04-2012, 02:31 PM
Join Date: Dec 2011
| | Do I Have Too Much Light?
Looking for feedback as to whether or not the setup I have would have too much light. I have a 200 gallon tank (7' long x 2' deep x 2' tall). I have constructed a custom hood for the tank and inside that hood I placed 4 2 bulb fixtures. Nothing fancy here...these were just your basic $30 shop light strips from home depot. The fixtures use T8 bulbs and I had purchased 6 32W 6000k "daylight" bulbs and 2 32W 3600k "soft white" bulbs. Going by the old "watts per gallon" rule of thumb (which I know isn't really a very meaningful way to measure the light) I would come up with just barely over 1 watt per gallon: 8 bulbs x 32w = 256 total watts / 200 gallons = 1.28 watts per gallon.
I'd assume, going solely by the watts per gallon estimate, that this would put me into a "low light" category. The lights, when all 8 are on, "looks" really bright to the eye. The plants seem to grow really well (have some water wysteria in there that seems to be growing like a weed plus some java fern and a couple of anubias nana). Something else I have is a TON of algea. I just can't keep it under control. Weekly water changes and a light cycle of only 8 hours, and within a day or two of a water change the water is right back to looking a murky green.
I know there are a lot of factors that come into play and there is no real single answer as to what my problem is...but as a general rule, do I possibly have too much light?