I've had a sun spider now for about 5 months. Found the little guy in my house. Anyway, since i have a colony of dubia roaches, i've been feeding him the little baby roaches. But he isn't looking plump like the other pet sun spiders i've seen. Is there something better i can feed him? I think he's just "surviving" on the roaches. I want him THRIVING. Any arachnid advice would be helpful. Thank you