I've used eggcrate and also not used it. No difference IMO as far as health of reef tank but it did save my a$$ one time when I was aquascaping and dropped a 40 lb rock.
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210 gal reef, 75 gal Refuge with 55 Gal sump mixed reef
100 gal Reef, 75 gal Refuge with 55 gal sump. SPS/LPS &
100 gal Japanese Dragon Moray eel tank with 40 gal sump
75 gal Brazilian Dragon Mor
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