Yeah it should be OK, but I would say you are now fully stocked. The only thing I would worry about is the P-seed stealing all the sculpins food. Just make sure the sculpins are getting enough, and you should be fine
it looks great! what temperature are you keeping it at?
yup def a pseed.. trying to get one for my tank as well posted about it to threads before yours.. i have a green sunfish which is in the same family and he will eat any thing u throw in there for he most part. as far as tank mates they are very agressive so as long as your other fish can hold his on i would say yes but def keep an eye on it. nice fish i hope to have one soon as well.