All ponds external filter 1000ef problem

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shellnchad

Aquarium Advice Apprentice
Joined
Feb 11, 2015
Messages
12
1st time using an external ,set it up filled canister with tank water and primed it ready for use,switched power on and 3hrs after it started leaking,so i emptied canister and started over,this time left canister empty and primed water straight from tank itself into canister ,canister doesnt leak now ,but i seem to have an oily residue on surface of tank water,what is causing this?

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