Geophagus

  • We are currently upgrading MFK. thanks! -neo
I take it all your fish are fairly young, and because of it, the tank appears to be sparsely populated and large. In my opinion, a 90 is not large, it is about the size of a water filled truck tire rut in in the road.
When the knife gets up to 20" if healthy, would in my opinion max out he tank by itself.
As would the Uaru, barbs and fests in another adult stocking scenario.
But at 20" being a nocturnal feeder the knife mayl solve some of your stocking problems by it self, meaning, while the smaller cichlids like the Kribs are resting, it will eat them. but before that, will try to probably eat the corys.
Geo's might out last some of the smaller species, but they do require high quality water, so as adults (the ones that aren't eaten) will need a more frequent and heavier water change schedule to remain healthy, in a then crowded tank..
If you do what you suggest, it will be an interesting experiment to see what happens, and I hope you keep us updated as to whether it works or not.
 
By the way, I'm not being sarcastic (well maybe a little) or facetious with what I posted above. Keeping the thread and its results going whatever the result is an important learning tool.
I know experienced aquarists that can keep way overcrowded tanks with simple box filters successfully.
Most of us can't, unless we accept regular death and disease as a result, and just role with it.
Especially with sensitive cichlids ike Uaru and some Geophagines, if kept in less than perfect conditions, they tend to HITH out and get permanent facial hole disfiguring.
If you have have soft, tannin enriched water, you may be one of the lucky ones with those species.
 
I am a very responsible aquarist I didn't just put a hose in the tank and say oh yeah give me 20 of these and 10 of those I go to the best and most know aquarium store in Pittsburgh and do research my fish and listen to what they say I am a very good and well know customer with them they won't sell you something that's not going to work in your tank they know everything about my tank they set it up it's a $5,000 set up I'm not saying I don't listen to you guys because I do value your opinions but I also value theirs
 
+1 to everything that Duane posted.

I would go so far as to recommend removing the BGK and Uaru, and then allowing the tank to mature, knowing that some day the loaches might be better served with a larger tank. That would be the responsible thing to do.
 
MonsterFishKeepers.com