What Would Be The Best Set Up For...

[world_wide_will]

A heavily planted tank with 4 neons, 3 palaties, 3 guppies, a pleco, 2 barbs, and a flownder?

 

[PRW1988]

Neons are shoaling fish, IME the bigger the shoal the better, boost that up to about 6-8, for the platies and guppies make sure if you're getting 3 of each to get all of the same species (ie only males or only females) unless you plan to get 4 of each because the general rule of thumb for livebearers is 3 females for every 1 male. Plecos grow huge depending on the species, if you get a Bushy nosed pleco you'd be okay as they grow to 5" maximum, barbs enjoy shoaling unless cherry barbs, so that number should be boosted, however I wouldn't recommend the barbs with neons as the barbs may kill them. A flownder I'm not sure how large they get, however I'd assume that the more area on the bottom of the tank, the better.


I'd recommend a 40gallon breeder tank, that way you have some options when it comes to stocking.

 

[starrynightxxi]

hm, better minimum numbers would be

6-8 neons
1 male, 2 female platies OR 4-5 male platies
1 male, 2 female guppies OR 4-5 male guppies
6-8 barbs
1 plec

I would nix the flounder because almost all flounders in the trade are brackish water fish UNLESS its Achirus achirus, see this link from the Oddball forum Flounder

As for the tank size, that depends on the type of plec. Some stay 3-4 inches, others can get well over a foot in length.

 

[dwarfgourami]

A group of female platies is also an option to the male group suggested by starrynight; IME you get less aggression issued that way, though you may get some fry.