Is my bulldog pleco too skinny?

[Orlon11]

Hello! I got a bulldog pleco 2 weeks ago from my local fish store. I haven't noticed him eating anything, and I can't get a look at his belly because he never comes up to the glass.
He mostly stays on one rock, in the same position, or on the driftwood just behind it.
I've tried feeding zucchini, spinach and algae wafers but he shows no interest. I did see some poop today for the first time so I guess he must be eating something.

Can anyone tell me from the photo if I should be concerned, or if he looks normal?

Thanks!

The tank is a 29 gallon, planted, kept at 75-76 degrees. Filters: Aquaclear 30 and AC 50. It was set up 6 weeks ago. Water is hard and alkaline - I don't have the exact values. There is 0 ammonia. Tankmates are 4 threadfin rainbows, 3 endlers and cherry shrimp.

[Silurus]

You can't tell for sure without looking at the belly, but your fish looks fine to me.

[N0body Of The Goat]

From my mixed results with Chaetostoma spp., I would wholeheartedly suggest quarantining them for at least several weeks, to ensure they have adapted to hobby food, as most (as far as I'm aware) are wild caught and often struggle to adapt.

A sure sign of feeding issues is a sunken stomach.

Chaetostoma spp. are omnivores with a meaty tendency, they eat the critters (aufwuchs) that live on algae covered rocks in the wild.

My four (1 dorsale; 2 aff. milesi; 1 mystery specimen) eventually learnt to react to New Era Plec Pellets; JMC Catfish Pellets; Tetra Prima.