10-15-2010, 03:36 PM
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Well if you are rich, then perhaps you could look into Reverse osmosis water. Its a very pure filtration system so the water into your tank may be "too clean" but you can add in the minerals and nutrients you need. Its more complicated but if you work through it, it will provide very good water for your fish. In the long run, it would probably save you money, its just expensive to buy all at once.
As for a larger tank, for the species you have that get large like the bala shark, Irredescent Shark, and pleco will all get to over a foot long, and require a long tank. The depth is not as important although it should be deep enough for the the fish obviously, but the tank must be long and deep enough for the fish to turn around comfortably in.
Its understandable to be confused, Ive had fish for over 10 years and I still have to stop and sit down and do a bunch of research before i understand what i need for new additions to my tank. Even after 10 years I still get tons of algae problems :-/. Ive found the best place to learn is to google, looking for fish profiles, usually there are facts that all of them agree on, and then here asking for people for personal experiences. The profiles available here are also very good. They are well researched, mostly written by Byron. Its a very frustrating hobby, but stick at it and it will reward you well.
Good luck with your fish!