For HOT skimmers, I'd recommend the AquaC Remora line or CPR BakPak 2R. They are both quiet and can be modified to be even quieter. Also, they ARE efficient for smallish tanks. They say that they are rated UP TO 75G but I'd not use it on more than 50 gallons.
My Euroreef ES 5-3 is real quiet, but you need a sump.
Dave
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Experience in aquaria, 35 years. Experience in marine, 20+ years. Experience in Reef Keeping, 6 years. Always a newbie! | 
