WOW, quite entertaining. Aquamonster if you have nothing constructive to say, quit reading the OP's threads and being a ****.
OP!! 30's 40's are more for fry or small fish. People that like the dwarfs or tetras or planted aquariums, these people use the 40's, and smaller. If you want the big fish, than you need the big tank. Sticking 1 Salvini in a 30 will not work. How would you like to be couped up in a small room all your life? Fish like interaction, and wouldnt you rather want to see more interaction, instead of 1 Salvini that constantly hides. If you want Cichlids than get some small cichlids. How about a pair of Sajica, or Cutteri, or HRP's. Small fish, not anything that gets over 6".
Maybe you should research planted aquariums and do that. Get a few Dwarfs in a nice planted tank, that would look awesome and be fun to maintain. Once you get older and wiser and more knowledgeable on the large Cichlids, then get yourself your big tank, (100 plus) and get yourself some big Cichlids. A lot of what you can learn is taking a look at other members threads. (media section) Do you ever see big Cichlids in small tanks? No, you really dont. Sometimes observing and taking notes, is the best way of learning.. You may also be able to then answer about 90% of your questions, yourself.
Again, Aquamonster, go find something to do.

And yes, I was talking to you.....