I recently setup the IM lagoon 25 myself and couldn't be happier with it. I left the top open and have a single A160we Kessil clamped to the back. The kessil gets decent coverage overall but does have some shading in the back areas due to my rockwork. I believe having 2 kessils would be overkill.. I plan on seeing how the coral responds to the current light before deciding if another kessil will be needed as one seems to do the job
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