thatll be enough flow but you want to make it so that tads, or frogs have no way of getting under there.
i would make a front for that false bottom, and cover it with some nylon mesh. i use a cross stitch type grid from an arts and craft store, but nylon screen will work fine too.
once youve done that you can hide it or cover it any way you like. the proper type of stones or wood would be my choice, but GS can be just as effective. you may have to try combinations of asome items to find out what works out best.
i cant tell, did you leave room on the sides of thet false bottom? it look almost like it goes all the way to the glass. ifi it does you may consider covering the glass in something before you cover the false bottom, so you dont have to look into there

you could also leave 3/4" or so around the edge and fill it with gravel, or even attach the gravel to the sides with silcone. this is what i do because i think it looks more natural.
what are the dimensions of the tank?
looks sweet! good job so far!