just lost 2 of my colonies

i was just doing some maintinace on my colonies i have porcilio scaber dairy cows and 20 ish giant oranges and about 30 wilds i didnt check on them yesterday but i did the day before and they were fine as i was looking today my wilds and giant oranges are both dead and i cant find any living ones as im clearing there tanks.

i dont know what ive done or whats happend but i am truly devistated anyone have any idea whats happened so i can prevent it in my dairycow tank any advice would be apreciated