my mudskipper died today, leaving me with a tank with nothing but 2 fiddler crabs a baby turtle and 2 feeder goldfish. The mudskipper stoped eating, he would go near the food but not touch it just sit next to it. He got less and less active, and his color kept on darkening. I think I will raise my water to six inches and elevate my land, then add another filter. do you think after thats done I should try again or try something else?