How much would it be to build a 100g tank (including glass/acrylic, sealant, and everything else I would need) i have no idea what the dimensions would be for the tank but i want it to be more on the long side about 4'-5' long. I have very limited knowledge of building tanks, so as much advice you could give me would be amazing. I think there is special aquarium sealant right? What would the preferred brand be? I intend to make this a freshwater tank eventually for my Red Belly Piranhas because as much as I love the three that I have I really would like a larger shoal and the 55g they are in now will eventually get a little cramped. So in the long run would this be worth it and cheaper than going out and buying a tank?