It is not recommended to change the hose size of the Eheim/Rena units. If they are using the 12/16mm hoses, you should stick with it. Using some other commercially available hose might be ineffective, if the hoses are not safe for use with fish.
Since the filters are designed to fit 12/16 mm hoses, using a large hose even with adapters, might affect the flow rate in one way or another.
You can get the Eheim hose from most LFS that stock it, like C328 and NA. Using clear hoses from hardware store, even if they are the same size.. might end up with you seeing the algae growth within the tubes more often.![]()
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