Picures make it hard to tell what all type of fish you have other then the two mentioned. Snails are difficult at times to get rid of but it can be done. If you would like to have the fish identified try to take photo's of the fish you would like the identity on. I love the Placo you have in your photo. Make sure you buy a test kit and read the instructions. As far as the filters give us a close up of them.