ANY serrasalmus can be boring in juvenile stages of life. Just as any Serra can be extremely active when that young as well. Just depends on what you're dealt.
Good Choices on the rhom or sanch. Can't go wrong with either one with a 55. If they were all in front of me, I'd lean towards the rhombeus because it would take a good long time to outgrow the 55.
I've always found that when they are in front of me, in a store, look for the ones that hit the food quickly....particularly if they aren't afraid to do it in front of you.
Good Choices on the rhom or sanch. Can't go wrong with either one with a 55. If they were all in front of me, I'd lean towards the rhombeus because it would take a good long time to outgrow the 55.
I've always found that when they are in front of me, in a store, look for the ones that hit the food quickly....particularly if they aren't afraid to do it in front of you.