ER skimmer making micro bubbles in tank??

[stephencraig]

For some unknown reason, anytime I turn on the ER, I'm getting micro-bubbles in the tank.

1) Any ideas what is causing it?

2) Do bubbles in the tank hurt the fish or corals (mainly SPS)?

This started only after I cleaned out the collection cup. It had been running fine for months up until tonight.

Stephen

[urban79]

where is your outlet running to. Maybe when you clean it you move the outlet and know its splashing by your pump...