Ok i added an overflow to my nano. I still cant trust the water draining on a restart. It wont drain fast enough. Also when i turn my 90 in the overflow upward it flows but i have the toilet sound.Do i need to have an air hole somwhere? The bulkhead that i have, has the 90 on the back (that goes to the sump) built onto the bulkhead itself so i cant just run a pipe upward. (if that makes sense) I will post a pic in a little while, but if anyone has advice please lmk. Thanks