ive had the gourmie for about a year now and hes not very big i don't think its a giant. the pacu ive had for about a month and half he has goten bigger thats for sure but i hope they well be ok for awhile. my 55 is built into the wall where you can only see the front glass, so when i put in the 260 i have to cut my wall and everything so id rather not do it twice altho i might just put the rays if i get them in it