Closed loop causing many micro bubbles

[One_Divided]

I was just thinking the other day how I've never had trouble with micro bubbles.. Well of course after installing my closed loop, my tank is fulll of them.. I'm not sure what is the cuase since there is no air being sucked in at all. It is a mag 5 going through a squid with two 1/2" returns. Both sides blow very fine bubbles..

Anyone have any suggestions as to what might be cuasing them?


thanks in advance,


-Adam