FYI I had six large (each was 6-8") angelfish in my 230g and there was barely enough room in the tank for the six of them. Highly doubt 12 would be happy in a 180g, simply not enough room for them to have their own territory. Unless the plan is to way over crowd them.

I think if you are feeding heavily and have a large bio-load a skimmer rated for way larger of a tank is a better way to go. I have two largeish skimmers running on my system and could use another.

Theres more linear room in the tank ill be running.
And as you know having a few large angels together usually results in aggression once one establishes its territory and becomes the dominent one. The point is to overcrowd for 2 reasons #1 no one can become dominent and establish a territory becuase theres so many fish in and out of the area that fish is trying to establish as its home #2 if one of the larger fish does some how establish a territory there are so many others that one or two fish arnt singled out and attacked, the aggression will be spread out over all the others.
I have spent countless hours reading up on housing mulitple large angels while I have nothing to do and seem to have concluded that is one of the sure fire ways to do so, and I have also puttin it into affect in a system at home to try it... I currently have 8 large angle species in my 90g with no aggression

WOW I feel sorry for your fish, not really fair to the fish IMO to stuff so many large angels into a small tank :sad: Just because you can do something doesn't mean you should, even Big Als doesn't put a bunch of large angels into small tanks together.

Its only temp not like there in there forever, but im not gonna get into fish vs tank size, thats not the point of this. And FYI ive seen almost every fish store stick a large fish in a small tank. An 8' tank is more then most people have for there angels

Sadly . . . No. Hopefully the manufacturer can provide you a better idea as to the skimmer's ability.

Ya I sent coralvue a email giving them the situation outline and asking if they suggest a SRO-3000 rated for 300g or a SRO-5000 rated for 500g.

E-mail recieved from corelvue:
You will appreciate the performance of the 3000 on that size tank with a large bioload. It will help keep your parameters in check and consistent performance.
So SRO-3000 it is!

what did you expect the manufacturer to say?:wink:

LOL if it was me... I would push bigger better... Just like buyin a truck, you dont want a tiny V6, you want a deisel LOL