Can I be successful with this setup? 15 gallon tank (24 x 12 x 12) 4 male guppies pea gravel decors: rocks, driftwood, silk plants heater two powerheads on either side of the tank 30% water change every week Concerns 1. Would the tank be able to produce enough bb? 2. If i do not have a dedicated power filter to house these bb, would there always be a mini cycle every time i stir and vacuum the gravel? 3. Can this setup be successful?