Yup, you're right, it's a Del. (Which is a cool fish, btw and you should get it.
)
In this sticky there are photos of each species. The retros, buettekoferi, and polli are easier to mis-label as each other, but the Delhezi and Retro are clearly different as the Del has those thick stripes like the ones on your photo.
https://www.monsterfishkeepers.com/forums/threads/all-bichir-polypterus-species-updated.684410/
Here's the Retro from that sticky - they're kind of peppered with spots.

Here's the Del with the stripes/banding - some have more than others.

In this sticky there are photos of each species. The retros, buettekoferi, and polli are easier to mis-label as each other, but the Delhezi and Retro are clearly different as the Del has those thick stripes like the ones on your photo.
https://www.monsterfishkeepers.com/forums/threads/all-bichir-polypterus-species-updated.684410/
Here's the Retro from that sticky - they're kind of peppered with spots.

Here's the Del with the stripes/banding - some have more than others.

Last edited: