Hello im planning on building a concrete pond....The monsters i have ryt now are a 12" Silver Arowana,5" Male Managuense,5" Red Tailed Catfish x Tiger Shovelnose Catfish,6" Common Pleco.And Will Also get me a RedTailed Giant Gourami....sooner or later and a Jardini,and a Oxydoras Niger with some Peacock Basses (Monos).But the thing is what are the tools in making a Concret Pond...well its not technically a pond but like a large aquarium made of cement like those you see in Zoo's.....It will be in my downstairs room....but the whole room measure as 13'x18'x9'....and i cant fill that whole space since if it is filled i can only see the tank through my door...and stuff.So i was thinking if it was possible to make the concrete tank 9'x6'x6'...for all of them to be in...and what would be the total gallons for that dimension as im not good with those calculations.What would the needed tools be? Objects need for building the tank? How big of a acrylic piece sheet would be best to see the whole tank in the frontal view...?