Don't dose micros and macros on the same day
Unless you want a cloudy 180 gallon snow globe instead of a fish tank.
Here's my guess
One of the micro nutrients reacted with phosphate, nitrate or sulfate macro fert ions and created insoluble salts. Those salts precipitated out, and made the water cloudy.
I have no idea what or why though, because iron nitrate and sulfate are both water soluble at STP. I'm not sure about phosphate.
Any other chemistry nerds out there?