Advice please.

We got these from a fish scooping game last May. The lady at the stall said these were medaka. So we brought a medaka tank and some fish food from Daiso. I added some plants from my garden that could grow in water and put them out in the garden today.

Honestly, I didn’t think they would live this long. What else can we do to take care of them better?

We’re based in Japan so anything from Daiso or Home Center would be easy for us to get. TYSM.