I was thinking you needed an air-intake stack so that you could suck clean air from over the miasma on the ground. Don't know how to pull it off. Could be natural, do you have "swamp gas", wetlands near that could exhale methane or HS?
Let me know what kind of fish you want. I might be able to put together a box. I'm mainly breeding piranha now, and I know you can't have those. But I have some other breeder sized fish, and it'd just be a matter of conditioning them for a spawn.
If it happens again I would put all the fish in a bag and contact you local Environmental agency because if it's killing all your fish it could possibly be causing you harm too!
Wow! I'm sorry to hear of your loss TOS. I'm curious to find out of he saved a sample of the tank water and get it tested to find out what kind of contaminations gotten into your tanks.
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