- Jan 7, 2021
I have a leopard gecko and I keep a colony of dubia roaches to feed her. I have an abundance of them so I have them in 2 different tanks the bigger tank being 10 gallons and the smaller one being 5 gallons. I separated them all from their tanks and into smaller holding containers so I could change the old substrate with some fresh and also change their food and water. Well, after I finished cleaning the tanks and setting everything back up, I started putting the dubias back into their tanks. The colony in the bigger tank are completely fine, but the colony in the smaller tank are literally ALL dying as soon as I put them back in the tank. Let me point out that there was nothing wrong with them when I took them out and I did not clean the tanks with anything harmful, only replaced the substrate. What could have caused them to all die off in such a mass?? I'm very confused because all was well beforehand.