It's all about the tap water up here in fort mac lol. If i were to guess i would say that your nitrates are higher in the 12 gal hence the increased growth rate. Corals use nitrates to grow as well but the increased level may be why your colors are lack luster in the 12 gal. Also, not having a skimmer in your 12 gal means you will have a lot more phyto growing naturally which also means more plankton for the corals to eat. I would love to see pics of both takes.
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