I never try 70W MH, so can give you answer with respect to MH. But I do grow creeping glosso on 2ft tank under 55W PL. In fact that was my first tank. I also able to grow HC on 2ft tank under 36W. In my opinion growing creeping glosso is more difficult than growing creeping HC. Probably because HC is very small, so even if it is not creeping as long as you do frequent trimming, you can't tell the different![]()
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