I will check on the air pump you talked about. I am in Quebec (Canada) and it doesn’t get very hot here (just few days in the summer) but rather very cold.
About electricity, will the Mattenfilter die in the tank (loose all his filtration properties) as fast as a canister? Maybe because of the bigger volume (tank vs canister) and the air surface, it will last longer in case of a electricity problem...
I understand your point and I am happy because I learn a lot here!
Still want your opinion on my borellii (see my other post before Happyfins please).
This guy seems to think that mattenfilters survive much longer in case of a power outage.
I concur. I had a corner style mattenfilter without electricity for 48 hours. No side-effects that I´m aware of.