i will bet you lol
that your micro bubbles are comeing from the input side of the pumps
prob a air leak around the poly line with the hose clamps
i had the same prob with my t3 pump it was sucking air around one of the conections i took it apart and put more teflon tape around it and my prob was solved
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65 gal tank 40 gal sump 20 gal Q tank
75 gal total frag system
200gal system in the works
4 year exp salty
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