The fluval hoses are the weird black corrugated ones with the rubber end pieces for connection to the filter barbs, and there are several sizes. The rubber connecting pieces are not the same outer diameter as the actual hoses. Even if you could find one with the right diameter end piece to fit on the biomaster, I doubt you could fit the Oase locking nuts, so you would either have to trust to a friction fit on the filter end or jerry rig something up with hose clamps. I am sure it is possible, and I bet there is someone out there who has done it, but it just sounds more trouble than it is worth. You usually hear of people ditching the Fluval hoses to go with normal ones, not the other way around.