Is my cucumber too big

[Basile]

Hi guys i have a bit of a dilema here i have a cucumber i bought he's very nice its a tiger tail, but its one foot long.....in my 150G . Someone made the remark that if he goes he could take my tank with it. Should i exchange it with some one with a bigger tank, just in case he starve in mine or do you have other options you can think of . I have another cucumber in there as well didn't expect that one to be that long when i bought it he was kinda in a ball sort of speak.