this all occured after a water change was done. i usually do a 2gl water change every sunday and i missed one i dont know if this was the issue. somthing else i noticed after this was like a greasy water surface i thought because i hadnt been running my surface skimmer for about 4 days and then as soon as i put it on the water got a bit dirty like all the debris on the surface got sucked in by the pump and made it all messy. im going to check my params tomorrow when i stop by aquatica and i agree that checking params before water change is beast because then new water wont have same results as the water thats bad just taken out.