Hes 10 inches and in a 29 gallon tank awaiting to go into my 150 gallon, my only worrie is my 13 inch pk bass. So should I wait or do you guys think he will be ok??? All opinions welcome.
Make a divider bro! I have a 4" right now in my 29G and my 125 has a 9inch albino red oscar around 3 years old who never had any tank mates. So what I'm gonna do is get some lighting panel and make it as a divider for a week and release them together after.
One thing I would like to add for aro transfer, is that always transfer the aro using plastic bags, do not se fish nets. Fish nets can damage the scales.
Personally I've introduced much smaller fish in with peacock bass around the same size as yours. No issues. I'm not sure how a 13" bass could even swallow a 10" aro. Personally I would do it especially because I feel bad for that 10" aro in a 29 gallon