Its a 6x2x2 with all mentioned in the one tank. The silver dollars are coming out in the near future and I've got half a dozen clown loaches in another tank that I want to put in. Used to have 4 albino tinfoil barbs at adult size in there but lost them last year when I had no power for three days after cyclone Yasi. Filtration is with a Fluval FX5 filled with pond matrix, separate aerator and regular water changes. Love the bigger tanks cause they are so easy to do water changes. Just hook a drain hose up to the filter, drain half the tank and then fill with the garden hose - 15 minutes max.
Giant gouramis are good fish to have as pets if you have the tank space. Some can be aggressive to other fish but mine is pretty good. She's a bit spoilt with food and can throw a tantrum if not given food she wants to eat. She throws this enormous wave of water out of the tank, soaking the floor is she's not happy with something. Loves woodies though so that can always calm her down.