Hello all! I have been through way too many tanks to count (from 5 gal all the way to 120 gal) and as far as aquascaping is concerned my 40B has been best while the 20 tall was the worst (imagine two ten gallon tanks stacked on top of one another). I love my 40 breeder but would like to eventually purchase a second tank that is larger. What is everyone's opinion on the tank with the best dimensions that is larger than 40 and smaller than 100. Thanks!