The color will be best when they reach like 8 plus inches, they will look a lot different then Edgar they do now.
i have a 4 in a half foot and 7 foot aquarium, one with koi fish and irdisident sharks, the other one is 7 foot with a rtc and a arowana, a fire eel and oscarConcur with all the prior posts. What size tank are they in now? Walking Catfish... you mean Clarius? If they are any size, keep an eye, they can be mean, and if they think they can eat something, they will give it a shot. Another question.. the main tank.. how big is this and what is living in it?