I like the simplicity of them I can't stand to see the heaters and things in my tank, but I don't think it detracts from your tank because it almost becomes a feature of them that way. Wish I had room in my place for more than one tank too I agree about the cleaning of them though. Also making sure that your fish will be OK size-wise in your tanks is a definate as well.
Needs a bit of imagination but as long as the fish are happy this is what's most important. Nice tanks themselves. Could better should the owner get a bit more creative rocks for the dempsey.... Fantasy decorations for the goldies for example
It is your tank and if that is the way you like it, then thats great. I would like to see hidding places for the dempsey when he goes into his new 55g, he would be much happier for it. :thm: