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Surface agitation can be achieved with canister filters. you can have the return line pointed at the surface of the water. You do not need a hob filter unless you want one. You can also buy a powerhead which will create more current and point it toward the surface to agitate it.

The more agitation of the surface with any type of fish is good because it allows the gases to escape the water. How you filter your tank is up to you but for tropheus you should aim for 7-10x turnover per hour.

When canisters are packed with media they do not flow the stated GPH that is on the packaging just something to take into consideration.
 
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