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A Reef In The Sky
Thanks a lot for the pointers. Bubbles are a concern for me. Infact I was planning to keep the outlet near the return pump so that the mulm can be pumped back into the DT...hmm need to rethink that.
I may have mis-led you. The drain can be near the return pump area for the reason you stated (for mulm) but don't have it right next to the return pump inlet. This old pic shows you
Can you also post some more pictures of your new LED lights and any ballasts too please