I know a bigger tank is in the future... but probably in the distant future as we are renting our house now and I do not want to push with the weight limit on the 2nd floor.... so the 55 is probably as big as I can go for a few years...
I dont get frustrated at all.... i actually enjoy watching a species for a while and seeing its behaviour and then switching it out.... my wife gets frustrated, because she says she finally starts to like a certain fish, and then I get rid of it!!
someone once told me that keeping fish is a hobby, so if you are not happy with your tank, change it up as many times as it takes... and maybe, that is just my style? have a fish for a few months then change it up for a few etc.....
I have considered buying a fish already grown, since I have really only done juveniles and seem them grow to midsize at best!!.... considering a pair of sals, nics, or jds next..... we will see...