Did you know fantastic help is an anagram of Planet Catfish? This forum is for those of you with pictures of your catfish who are looking for help identifying them. There are many here to help and a firm ID is the first step towards keeping your catfish in the best conditions.
I'm a little late to the party, however, I agree with Richard and Silurus. These look like S. lucipinnis. The spots on the body are too irregular in shape and size. You can't really see the anal fin too well in any of the pics or the fish are too small to see well, but in the S. petricola, the black part will be triangular shaped and all black--with no light part on the fin between the black part and the body. In S. lucipinnis, there will be a lighter part on the aspect of the anal fin closest to the abdomen. The black part won't be triangular shaped. They explain it really well in the article Birger provided the link for.