Canister filter Micro-bubbles

Kisseskriss

New member
We did a water change last night and suddenly we're getting a ton of micro-bubbles (every 30 sec to 1 min) coming from the canister filter. (It's a fluval 106)
I've tipped it around and it leaks out the back. The main seal looks fine, and I've cleaned a few bits out but I'm a bit stuck. I'm assuming that a bit of the sand may have gotten in and that's what's causing the problem, but I'm not totally sure where I should be looking for it.

TIA
Kriss


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