For heavy duty purposes, wheather exposure, easy handling and economical you can use a fibre tank. You can have it indoor or outdoor. Color of tanks are varies. White and blue are common.
You can play with the water level too. You can have the water at low when the fish at juvenile size and set the level higher when the fish grow adult.
You can put the fish in 5pcs of each tanks with 5X2X3 or all comm together with 8X4X3 - 20pcs.
Must plan well...either indoor or outdoor setup. Indoor setup you can accomodate them with a glass tank too. Bigger the size - much better.