I have a2080 on my 180-with a classic 2217 and an Otto 2000lph.
All I can say is one thing I have learned from listening to the advice given here.....just because it is given and stayed with absolute confidence don't mean it actually works...listen, try it for yourself and make your own judgement...I took a lot of words for gospel, did exactly what I was told to find I had wasted time...and money in some cases.
Advice included the classic "have inlets and outlets at opposite ends" which you can find people advising here and ask over the internet....I find this setup crap...I read the eheim website the advise have them at same end so I tried that...it worked
Works great....one it's configured right...one thing I got from a user here was with the 2080 have BOTH inlets at same end then place the outlet where the eheim manual says outlet at same end add inlets pointing at the water surface causing nice circular flow.
I asked some questions along the same line as this when I was setting up my 2080-I got the same responses "buy a bigger canister" ""2080 can't do more than 125" "2080 only pushes 150lph"
First off,I tested the flow, my 2080 is packed with eheim Mech Pro, and 2 trays of seachem matrix, I primed the canister and allowed it to flow into a20l bucket when I had at the same hight as my tank to simulate head loss...times the length of time to fill the bucket then did the maths (I am a mathematician by trade) I got 92% of the eheim quoted flow...
I will agree that the 2080 is not to hot on mechanical...if you want purely mechanical get a 2262 or if your in Australia a 2260 and mod it since they don't have the 2262 there...it is a$5 mod...
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