Well, I've been away on a family vacation. (By the way, if you want some tips about holidays and fishes, here's a post about it) I left my fishes with a relative.
What I forgot to tell you is that I bought a starter culture for my tubifex. I dumped it in the tubs containing gravel from my planted tanks. I never had the chance to take a photo (even now because the camera broke during the trip).
I want home today. I noticed that there are tubifex cocoons. This means that my tubifex are breeding and growing. I've seen a lot of them. But they still don't have the distinct red color (hence the nickname "bloodworms"). They're still a very light brown.
I continue the drip programme and refilling the 100gal tank every morning.