Hello i just plumbed this tank yesterday. It has 2 drain bulk heads that are thread times thread. One has a threaded strainer on the inside and threaded 90 on the drain. Other is pluged with a threaded plug on bottom and threaded pipe on the inside above the drain that is being used. Return line has a threaded 90 degree to barbed for tubing. Quistiin is i am noticimg som white peices in the tank it is the thread sealant i used for the bulkhead this sealant is pottabke water safe. Is it ok in the water or do i need to drain amd reseal another way. Has no fish but will have fish saturday thanks