i voted that i change it every year but really im just moving things around till i can find that right set-up that im happy with, i have sold some fish in the past when i was changing set-ups but i always miss them and wish i could have kept them, like right now before i went the geo route i was contemplating trying to buy back some of my fish from a guy i sold them to but went a different way, but really miss some of the fish that i had like my vontehillo and festae juvie, just wish i had another large tank where i could keep them all then i wouldnt get rid of any of them