Death by algae??

[Borderjumper]

Yeah weirdness.. I have cyano in the big tank and regularly stir it up and let if float with no issues.. One of those things I guess.. You would think whatever it waswould have killed all the fish if it were so damn toxic.. No clue.. The mag float is always kept out of the tank in the same place and I'm pretty sure had no contaminants, and I'm pretty good about washing may hands before I touch my tanks, so it has to be what ever was growing on the glass.