grubs is a generic term for the larvae of any insect that has a maggot like larval stage. this includes a lot of insects, most flies and a lot of non fly insects, house fly maggots are grubs , waxworms are the grubs (maggots)of waxmoths, even mealworms&superworms have a maggot stage. black soldier fly grubs are simply the maggot (larval stage) of black soldier flies, they are a great feeder in moderation and high in calcium( a better ca/p ratio than crickets or most common feeders), but have a tougher more leatherier exterior than say waxworms, or the maggot of something like a house fly, so they are not as easily digested by chams with compromised digestion, or chams that are dainty eaters, non chewers. alot of montanes have problems digesting bsfg because of their slower metabolism and the lower temps they are kept at. an undigested bsfg will look pretty much like it did when it was alive except that they come out dead (fairly common). nipping them in the side with a pair of nail clippers can help aid digestion. black soldier flies and their larvae are easy to grow (in huge quantities) in most areas that are above 60* they are commonly bred for feeders for tropical fish or other farmed freshwater fish and as a byproduct produce a compost that is highly prized by gardeners. they can be easily grown using a biopod or other homeade facsimile, with almost little or no effort. pheonix worms and calciworms are the same thing. calciworms is the registered trademark of timberline fisheries and only they can legally market them as calciworms.
Reptile Food
Serial Number: 78932655
Registration Number: 3321784
Filing Date: Jul 19, 2006
Last Applicant(s)/
Owner(s) of Record
Timberline Fisheries Corporation
201 East Timberline Drive
Marion, Il 62959 US /pheonix worms is a registered trademark of insect science resource llc. (dr. craig shepard a university of georgia entomologist) but they are all the same thing. the larval or grub(maggot)stage of the black soldier fly (hermetia illucens) according to dr shepards website bsfg produce lauric acid which(as claimed by dr shepard) to discourage coccidia (i personally have my doubts as to the practical application of this statement. jmo), details and nutritional analysis can be found at his website;
http://store01.prostores.com/servlet/thephoenixwormstore/Page?template=comparison / edit ; as far as i'm concerned, they are a racket, why they are so expensive is beyond me, somebody with a biopod or similar can easily produce several to as much as 10 or more lbs a month. jmo
I saw a web site that sold Soldier grubs which are black soldier fly larve also under the name Calci worm & phoenix. Was thinking of adding to my chams diet for variety.
But its been mentioned enough times on this forum by people who generally know what they're talking about, that it seemed worth repeating. Sounds like your cham chews some, and that's all it takes, just one small hole, for the digestive juices to do their work. 
