ok ok ok not really homemade but kind of, for some reason I have blackworms constantly breeding in my 55 gallon tank....When I do a gravel vac I get rid of thousands then a couple of weeks later theyre back lol.....They stick out of the gravel like a little carpet of grass and the corys go nuts digging them out lol...

My own homemade worm farm lol

Are they actually black?

In my tank, I've occassionaly seen little white wormy things that the fish readily goggle up (like everything!). But I've seen these things walk end-to-end across the glass, like they have a sucker at each end.

They'd be about 1mm or less thick, and about 15 to 20mm long.

That's pretty cool. Where'd the blackworms come from? My fish would love them.