You definately will want to vary your feeders - sticking with just one is never a good idea. Most people use crickets or roaches as a "base" (I don't want to use the word staple here.) Then, they add in other feeders to round out the week - like hornworms, silkworms, mantids, superworms, etc. If I were you I wouldn't feed that many Phoenix Worms at a time - maybe one feeding per week, but not more than that. As you have stated, they are high in calcium, plus you just want a more varied diet for your cham.