[I am thinking of building a 25' x 25' x 25' cube with an overflow in one corner. I was wondering what thickness acrylic I would need for the tank walls. Also if marc glances at this wich i'm sure you will, could you give me a quote if your willing to make it? It actually will be about 68 gallons, so it's not really a nano. Oh well...thats the begining...lets see if the tank is created first.]