05-31-2011, 01:31 PM
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Welcome to Tropical Fish Keeping forum.
Mixing the larger cichlids is usually not possible unless it is a very large aquarium. You mention a 260 litre (roughly 70g, 4-feet in length presumably) tank. This is not sufficient for Festae (Red Terror) cichlids that can attain up to 20 inches in length and are highly aggressive. Cichlid authorities recommend nothing under a 200g tank for this fish, so I would forget it.
Convicts will work, they attain 6 inches and are relative peaceful except when spawning. A 260L/70g works for this species.
Clown loaches need a group, five would be better than 4 as this is a highly social fish; they attain 8 inches and possibly larger, and a 6-foot tank is best for these. I realize you mention re-homing fish later, but this is not always wise, as circumstances can change and the fish is the loser. There are other loaches that remain smaller, but the convicts are an issue; when spawning, they can be very rough on any other fish, including otherwise "thick-skinned" fish like a pleco.
Common Pleco attain 12+ inches and need more space than what you are proposing. There are smaller species in Hypostomus for example, but again the behaviour of the cichlids has to be considered.
Bala Shark should be kept in groups due to their social structure, and a 6-foot tank is minimum but most recommend 8-feet. You can read more on this species in our profile, click on the shaded name.
A group of at least six Silver Dollar would work in the 260L tank, but not with Convicts. More info in the profile.
Hope this is of some help.