put ebb and flow screen in without pipe tape

is it ok if i just use aquarium silicon to seal the outside or should i do around the rubber washer on the inside as well? it is too tight to take off now that its on

edit: its the ebb and flow fitting not the screen im worried about. however should i put seal tape on the screen too?

well it can't hurt to run a bead around it, oh btw, regular silicone works just as well fraction of cost, i know people that make fish tanks & only use regular silicone, i ran some inside & outside just to make for sure & never had a problem, better to do it now than after a leak

get a pond liner or geomembrane and save yourself definite future leaks, check my sig below