I have a 10 gallon set up for my toddler, and the decor is dinosaur themed. I was wondering if there are any ancient-looking fish that would be small enough for this tank. If I can't figure anything out, I may just get a newt or an axolotl. Current inhabitants (which are able to be moved if need be): 3 corydoras, 2 female bettas, 3 common (feeder) guppies that refuse to be eaten by anything. Serious suggestions will be greatly appreciated! Thanks.