That is great news and knowing that FELDA had already started on the biodiesel programme with bsf is also another wonderful thing to hear. From what I've read in other's blogs, bsf usually hides during daylight but I guess it is logical since grubs are at the bottom of the food chain. They had to remain inconspicuous to avoid ending up as food for some frog(yes, frogs eat them but I'm not sure about gecko/cicak) or bird.
Where did you found those bsf larvae, I mean in what locality? Is in the city, dump site or the jungle? I hope you would start breed a sizable number of them. I would really be interested to buy some from you to start breeding my own bsf. Well actually not now because I'm too busy for my final year studies and it's not like I could carry those maggots everywhere I go. I'll settle down in about a year and maybe earlier if I could get someone to help me take care of them.
Anyway your idea of using chicken skin and fat and covering it with soil might be a good idea to attract bsf while preventing other types of flies access to the putrid matter. I think it's somewhat related to the way that the bsf laid their eggs or something, my memory a bit fuzzy on that, maybe I should do more further reading.
In regard of them escaping your fishtank, maybe you should do what gary and the others did. Put them in the refrigerator and let them froze to death first. When you toss them into the tank they'll be nice and still like any normal fish pallets. Although I'm not sure if Malaysian fish like frozen food...you could let them thaw a bit...
