Most probably an SRD from the looks of it. But need some more development to be sure.Any updates here
I guess they were feeding live feeds so he is not taking pellet foods or tetra bits even.Am little worried it's been nearly 5 days and not sure whether he is having it or not as it just comes up and spits out .what was the seller feeding? It might be better to get it into a bare bottom tank for a while so you can vacuum out the uneaten food & keep your water quality good
As said earlier get the stones out, keep it bare bottom. Try giving frozen brine shrimp or frozen blood worms. Basically in thailand breeders give shrimp paste from what I have seen. If there is no progress try soaking the food in some garlic before feeding.He/she is not any pellets.Am trying to feed tetra bits as he is so small but it just avoids.its been 3 days without food.Ieven crushed pellets but he is not picking it