1. how much do koi grow a year?? like, how old is a 3 in. koi, & how old is
a 12 in.?? seems like my goldfish are growing & the don't.

2. also,,, I have read on here about how koi love to trash plants. is there
a certain size they get to THEN they start doing this?? and/or do you need a
gang of them?