Yesterday I installed a new sump for my 110 gal tank. The sump is a 30gal glass tank with partitions I siliconed in. I saved all the media and put it in the new sump. All water perameters were perfect before the switch. 24 hours later my fish are sick and laying on the bottom of the tank. I'm wondering if I killed the good bacteria and polluted the tank or if you think the new sump maybe has polluted the tank. The new sump did have some new PVC parts to it. I am about to do a water change to hopefully improve things. Any ideas out there? Thanks.