I remove my fry and put them in a 'nursery' ('vase' with a bubbler (with a sponge filter) and some plants....)
All in the 'nursery' cost:
The large vase I had but its a nice square one that is 9 inches tall, so the filter doesnt splash. Craft stores usually have sales on vases.
Plants: I had trimmings and a anubia I forgot about in a jar on the windowsill in my laundry room, lol
Air bubbler: 4.80
sponge filter: 3.00
The light: I had- but you could pick one up for 6 bucks
I used some of my filter media to season the sponge filter. I feed my fry 4 times a day (they get live brine shrimp that I grow in a shot glass, frozen fish frenzy (veggies and protein), first bites or crushed flakes into powder), and do two water changes each day.
By the time my fry are large enough to go into the main tank, ill have another cycled quarantine tank (but ill use it for fry in the future).... which you should ALWAYS have a quarantine tank. So it may be worth setting it up regardless.
Thanks everyone! It's a fun little surprise, I'd love for it to grow and find out what it is. I'll leave it in there for now, but when the cycle finishes and I add a betta, I'll probably move it until it's big enough not to be a betta snack. I did grind two 'Bug Bites Betta pellets" and tried to feed that tonight (more stuck to the grinder and my fingers I think!), maybe it'll help, maybe not.
When you can take more pictures (they can be far away so camera can focus.... then magnify when on your computer) it will be so exciting! im slightly jealous, I like mystery fish.
They should make that a thing.... you order a box of 'mystery fry' haha!