Yes, I've researched that Chinese Algae Eaters can grow quite large. I know the Golden Algae Eater is in the same family as the CAE, and no worries, I fully intend to move the fish once it's growing. It's currently just under 2 inches in length so I'm not that concerned.
And though I have read about them being more on the aggressive side, the one I have seems to coexist with my betta really well.
My boyfriend had the idea to put Tiger Barbs in one time because he once had a larger tank of TBs and a betta and had no issues, but one of the TB immediately started to chase and try to nip at the betta, even causing him to start becoming pale with stress, so the TBs were moved to another tank. I was sketchy from the get-go about the TBs because I know they are semi-aggressive/aggressive fish and are fin nippers.
I've monitored my beta and GAE's interaction very carefully, if anything seems out of balance, best believe I will handle it. :) I appreciate the concern!