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- Feb 8, 2016
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would i have a lot of shading at the back /side of the tank ? for ecotech radion g4 pro i will need to use 3 unitsGHL's own specifications, which seem to mirror most folks' experience, is one light per 24x36 space of tank you are trying to light. In your case, it seems like 2 fixtures would do the trick. I plan on 2 fixtures for a 48x24x20 tank, so not too dissimilar in dimensions.