So, I upgraded from the 72 bow front to a 120 gallon. I traded out the gravel for sand and got rid of the undergravel filter and currently don't run any type of air pump into the tank. I currently run Fluval 306 x2 and aqua tech hob x2. I guess my main question is... is the surface agitation from the hobs and canisters enough to oxygenate the water? Thanks in advance.
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