We have a new custom 250 gallon saltwater tank that has been cycling with some small starter fish for about 6 weeks. We are about to start choosing our new family of sea life! We have children and are looking to have some interesting, out-of-the-ordinary fish, including eels. I understand this means we will have an "agressive" tank. We do have professional help to get us started. What suggestions do you have for specific sea life that will be compatible?