A 30 gallon is definitely NOT large enough for the one comet! If he has been living in a 30 gallon for 8 years, he is most certainly stunted. At 8 years old he's already done much of his growing, but in a 120 gallon tank you will likely see a big growth spurt. Comets shouldn't be kept in anything smaller than a 55, if only because nothing smaller than that will physically hold a full-grown comet.
As a side note, Kashta, I can't believe Sprocket is so big already! He's growing so fast.
As a side note, Kashta, I can't believe Sprocket is so big already! He's growing so fast.