just lots of wasted electricity, I guess. What you can do is run your MH for ony two hours a day and run the other 8-hrs using your NO. In my current tank, I run 2x250w MH for 5hrs. and 8-hrs. of VHO...
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I don't see any brown spots....anyway if it is brown mucus-like, then your froggy might might some infection. You might want to break move that infected branch from the rest of the healthy ones or put a little more flow to blow the mucus away. An idodine dip might help too. if the brown...