I currently have a 20G long and am looking to get a larger 2nd tank. I bought a 40g breeder (still brand new, not used yet) but am thinking about returning it an exchange for a 55g. I have purchased a Fluval 306 (rated up to 75g) and have a 250w heater both purchased for the new 40b. I am also picking up 80lbs of sand (Black Beauty) this week. The only thing I have not purchased is the lights. I have a table for the breeder but would have no problem building a DIY stand for the 55. So all in all cost isn't a major factor between the two because of the Petco $1 per gallon sale right now and I believe I have most of the equipment that would be suitable for either or. Either way it would be a community tank with plants and driftwood. Stocking as follows (5) Bleeding Heart Tetras*, (4)Zebra Loaches, Possibly (5) Cory's, pair of GBR's, a few male guppies* and platies* (*)means from the 20L. My question is what are your opinions of the tanks themselves? I kind of like the shape of the 40b but like the thought of having an extra 15 gallons to work with as far as stocking and general water care. Thanks for any advice.