Unfortunately, (apologies if you already know this, but it may help someone else) there is a lot of confusion between the SAE and CAE... Often the latter is sold as the former.... They do look fairly similar when small, but as the CAE gets older it starts to harass other fish and develops a taste for their protective mucus (especially on larger fish). They can cause all sorts of issues. Make sure you know you are getting the right one.
As for jumping, it is fairly rare for SAE to jump, though not unheard of, especially if they are being attacked or chased by another tank mate. CAE on the other hand can jump when chasing other fish, or just for the fun of it. Generally speaking the true SAE will eat algae when fully grown and gently graze away... They are also especially handy with beard/hair algae which many others won't eat. I have not seen a genuine SAE in the trade for a long long time, though the past few years I have to admit to not really looking.
Cheers
G!