Great thread, only just found it
I can only get expensively imported crabshell meal, so I use frass to supply my chitin. It is fairly cheap over here, but I do have to go to the hydro store to get it and I really wanna break away from them completely.
..............so, I decided to try making my own, with the benefit of having mealworms to give to my mates chickens, in return for organic chicken shit for the compost pile.
It's 'experimental!' and was fairly cheap to set up, but I think it may be a long process before I harvest any frass. I bought 5 packs of baby mealworms for £10 to get my colony started. The base material is organic porridge oats which is also their main food source. For a water source I add a variety of fruit and veg waste, but have found they prefer banana skins, carrot ends and their absolute favourite, broccoli stumps. I've also experimented with adding various soil amendments and found they will eat pretty much anything I put in there, here's a list of what I have actually witnessed them eating - volcanic rock dust, oyster shell meal, seaweed, neem, calcified seaweed, gypsum, comfrey, alfalfa and cannabis leaf. I also tried putting freeze dried coconut powder and aloe vera in. They went into an absolute frenzy over the aloe vera, and you could see them gorging on it until they couldn't move, so I decided against using it again. Something really funky happened with the coconut, the meal worms that tried eating it were instantly killed, it drew the moisture out of them and turned to a nasty mush, not good.
1 week between photo's, they must've been thirsty
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Various shots of the amendments
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My first few pupa and beetles, born as eggs from the first worms I bought, in fresh oatmeal hoping they start breeding soon so I can start harvesting their eggs to add to the worm/frass producing drawer
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