Tank size should be fine. Hystrix X retic i cant wait to see... as far as value, it is really going to be a toss up as what they look like. Hystrix and Retics stay the same size. Actually if you include the tail a hystrix is smaller than a full grown retic. But given that they are CB and that young I would sell them around the $100 mark... depending on what they look like. It is better than going to a petstore for a ray.