Plecos are freshwater, Also I see in your signature that you are using 3 fluval 404's, what media do you have in them???I have found that canister filters to be Nitrate factories unless you change half the media at least once a week....Also I see that you had a lot of fish in your system which would result in a lot of organic material in your water column and when your skimmer stopped running you could have possibly had to many toxins in the water!!
When you pulled the dead fish out of the water where their mouths wide open, cause thats a sign that they died from not enough oxygen!
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500G Mixed Reef
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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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