Blackworm Culture for Fry?

[Daydre]

So I have some fry I'm raising up and I want to get them on blackworms at some point. Anyone have any tips for culturing them? I've been doing my own research on other parts of the internet and I read this thread on the matter on this very forum but I was wondering if there was anything else I could learn before I start. Right now I have a plastic bin with a layer of gravel and about eight inches of water in it. I'm seeding a sponge filter to cycle it later and I have a place where I can buy starter blackworms.

Admittedly I kinda want to keep this on the lower effort side because the culture's going to be in my basement for temperature reasons and I don't yet have an easy way to do water changes. (Aside from carrying a bucket up and down the stairs lol)

[Guppysnail]

I have never done blackworms but my fish and fry thrive on white worms and grindal worms. No water change needed almost no effort.