mini tank crash....palythoa toxin the cause???

[marie]

Given that everything happened after the palys were added I would suspect chemical warfare of some sort going on.

The first thing I would do is remove the palys from the system and put them in a bucket of tank water or something, then do a huge water change (as big as your comfortable with) and aggressively run carbon. If it is the palys that are the cause of the problems then the tank should start to improve rapidly afterwards