Manufactured hobs don't cut it for big tanks in my opinion. For $110 you can build something far more superior. Buy a 4" pvc pipe and 2 end caps. Cut the pipe in half to make a moon shape. Put a barbed fitting onto one end cap and glue it to the pipe. Attach hose and place a drain on the other end. Done deal. Like having 3 gallons of media storage in a HOB for $25 not including the pump.
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Sent from my SM-N900W8 using MonsterAquariaNetwork App