I do not have a gravel vac but I will most likey purchase one when it comes time to upgrade my tank. Either way though, I like bottom feeders, and the Multiple tier fishtanks. 
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10 Gallon:
FW Community
20 Gal Whisper Filter, Heater, Red Gravel, Fake Plants and a plastic Artillery gun
55 Gallon:
4 Red Belly Piranha
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