Originally Posted by LittleBettaFish
Yeah betta fry are absolutely tiny. I have raised wild betta fry to a month or so old before on just whatever they scrounged from the tank, then I supplement with BBS and grindals.
The common recommendation here is to use PSB (?) in a jar with plants, put it by a window for about a week, and things start to appear swimming around in it.
The PSB is sold as an additive that can help maintain water quality, but no one actually uses it for that. I guess it strongly encourages the growth of infusoria while preventing it from "going bad". I am wishing I had picked up a bottle of it...
It's cool watching the fry develop in their eggs. I have a container full of killifish and pseudomugil eggs that I have been hatching out every few days and you can see their little eyes looking out at you.
It is! I have a tiny flashlight I use for egg hunting in the main tank. After a couple days I can find stray eggs by the reflection of their eyes.
With the medaka, you can also see the color of the fry while they are still in the eggs. There are gold like their mother, black like their father, and a few between. The black ones are very obvious as they really are black inside the eggs.
In other news, my algae eating shrimp are also carrying eggs around now, so there is a bit of a baby boom going on!