Schrödinger's medaka
This is a stupid question, but please bear with me.
So a week ago I put ten tiny fish in a big 200 liters outdoor container, and I gave them way too many hiding places (plants, rocks etc). Now I almost regret my decision - which is why I'm here. It's my first time keeping fish, I read a lot and watched many videos in preparation, trying to offer them optimal conditions. I've been checking the water almost daily, everything seems ok.
The stupid question is: HOW DO I KNOW WHETHER OR NOT THE LITTLE SH*TS ARE ALIVE, IF THEY'RE HIDING??!!
A few days ago I sat next to them for about half an hour and managed to count at least 7, but since then I only see 2-3 at a time. It's driving me insane.
If they die, will I find them floating on the surface, or will I just have to wait until the water smells of fish-soup-gone-bad? Is there anything I can do? I tried luring them with food, but I think the mosquitoes are already feeding them too well.