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got any experience? I have a 40 gallon tank now, but in a year or two I will need a bigger tank. I think a 200 gallon tank is the final solution. But its too expensive. I hope some people have built their large tank, and can share some experience here with me, and with others who would like to do the same.
What do I need to build a large tank?

Hi. I built quite a few aquariums about 10 years ago....all I needed was 3/4" thick glass (I used smoked black for the back wall) and aquarium sealant (buy it at any local pet store) and a glass cutter (small tool available at Home Depot or OSH) There is a specific formula also....I have a friend who owns a glass shop....he is the person who got me started building aquariums.....he knows the formula and I have sent him an email. When he responds I will post the formula for you.

200 gallons holds a lot of water and a lot of weight, i'd think that'd be best for a pro to make. Perhaps you could buy a stock tank for an economical solution? It'd just be really unfortunate if your tank didn't hold water and your turtle and belongings got damaged...

When building your own aquarium, you need to make sure you are using sheet glass, not tempered glass. With tempered glass, a tiny leak can cause the tank to burst. Use 100% silicone made specifically for aquariums to put the pieces together. For a 200 gallon aquarium, you will also need to have braces at the bottom and top of the tank. And remember that the silicon needs at least 24 hours to cure - 48 hours is better. You don't want a "Deuce Bigalow" accident!

I have a home built tank (125 gallons 60x24x20) and it could be expensive. You could consider using a stock tank which would be far cheaper than any glass tank of equivalent size....