If yours is the conventional 6 foot long 125 gallon all-glass aquarium, then you're definitely not going to be able to get away with a single light, no matter what the size. One MH is generally used to illuminate two feet of tank width. If you already have a 175, simply add two more and that would be perfect.
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- Sam P -
plantedtanker in limbo - all tanks currently in storage
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