01-13-2010, 04:40 AM
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Unfortunately, I think you're going to experience problems with that stocking list. Tiger barbs need to be in large schools in order to reduce the amount of aggression between them. I would suggest 8 fish minimum although you have room for quite a bit more than that in a tank of your size. The barbs are also going to nip at the betta's fins constantly, which will eventually result in the death of your betta. If they are common plecos, they will outgrow a 180l tank. Smaller pleco species like bristlenose, clown or rubberlip plecos would be more appropriate. Silver sharks (by these I assume you mean bala sharks) and clown loaches will also get much too large for your tank.
Sorry for all of the bad news! 180l is still a very decently sized tank and there are plenty of options for fish that will cause less problems and are just as interesting as the ones you've got picked out.