Best HOB refigum for 75 gallons with canister filter

[AaronB5916]

So I am looking to install a refigum into my 75 gallon saltwater tank and I have no room for a sump and I already have a canister filter so my last option is a HOB one but I have no idea what size and which brand to get

 

[blaxsun]

AquaMaxx and Fiji are two that come to mind.