Good luck. Hope they like green stuff. With their coloration, I could see them eating something in a reddish diet.
Love Emerald Crabs. I am wondering how many is the right number. Why did you go from 1 to 4? I just have one red one in a 125 gallon and no Valonias yet to speak of.
Jonbear: I wanted more than one because one didn't eat them up as fast as they reproduced in my tank. So I ordered 3. But the guy sent me a bonus... :-) .... well, I didn't complain, as I know these guys don't live for too long. Melev: Regarding the red if they eat my red bubble algae I'll be happy too, as I have a lot of those in the tank on some rocks... not as spread out as the green valonias, but annoying enough...