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I am planning on populating it with
1 Oscar (already owned in a separate tank)
3 silver dollars (already owned with the Oscar)
1 Archer fish (already owned)
2 large other large Cichlids
1 freshwater long fin eel
1 large catfish

Can anybody tell me why i would not be able to get these fish together in a 360 liter tank with a Fluval canister filter?
Do any NEED brackish water?

Any other suggestions for fish, Thanks

The Archerfish is a brackish water fish,so a prolonged exposure to freshwater might be harmful. Also you don’t name the species of the other two Cichlids. They may or may not be a factor. I’d give the old tank to the Archerfish and make the new tank as soft as possible with a low pH,and maybe a peat filter to mimic an Amazonian black water river.
That should be plenty of fish in the new tank. And the old tank can be converted to a brackish tank to keep the Archer and some Monodactalys or Scats,or Orange Chromis (or Green).

1. ceci9293 Says:
   April 26th, 2010 at 12:53 pm

   I don’t see any reason to mix Oscars with other cichlids. Even with plenty of room in the tank, there’s bound to be aggression problems. Why risk it?

   I don’t know that any of them are necessarily brackish water fish (though I *think* the archer fish is, but I’ve never kept one.)
   References :

2. PeeTee Says:
   April 26th, 2010 at 1:29 pm

   The Archerfish is a brackish water fish,so a prolonged exposure to freshwater might be harmful. Also you don’t name the species of the other two Cichlids. They may or may not be a factor. I’d give the old tank to the Archerfish and make the new tank as soft as possible with a low pH,and maybe a peat filter to mimic an Amazonian black water river.
   That should be plenty of fish in the new tank. And the old tank can be converted to a brackish tank to keep the Archer and some Monodactalys or Scats,or Orange Chromis (or Green).
   References :

3. wenger Says:
   April 26th, 2010 at 2:09 pm

   i think the brackish water problem is not actually a problem…….
   the above fish setup is TOOOOOO much for the tank…..
   a full grown oscar requires about 75 gallons and ur tank is 80 gallons…….
   id say the oscars and the dollars shd be fine but DEFINITELY not any thing else……
   References :