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I can give two pieces of advice based on my experience. 150watt heater in a 20 gallon tank is too much, not that it won't be efficient but what happens if that thermostat sticks? (long time fear of mine) The other comment is that the amount of flow from your sump will be awsome in a 20 gallon, try to creat a spray bar to disperse the flow. What kind of internal filter will you have in the tank?
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
http://www.canreef.com/vbulletin/showthread.php?t=55041
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