Thanks for the adviceCould be. Sometimes like was mentioned above, they are the wrong ones. Mexican turbos are from cooler water and have a hard time above 78. Or maybe you have some contaminate? Hard to say that though, i would think all the inverts would be showing stress, but you never know. If that is a worry chuck in a 'polyfilter'. Quotes to make sure to specify the name brand one that is supposed to pull metals and other gunk.