Yes it does , small only like 1" piece of course foam and enough storage space but you could cut to fit anything you want. It's only 5" long and 1 1/4 wide runs at 5 watts . Keep's that dam 3'x5' surface perfect ! I love it ! Big Al's Pets sale for $24.99 used my points got it for $9.99 best product I got in years. With a stock tank you must have clear water to look down into it and always did but using this skim 350 never thought it could get even better. I only got it for the cork dust but it some how does more. At 18" water I can just about count how many eggs are in my ghost shrimp on bottom. Will see how many days till I have to clean it , who cares if its daily , it's good. Have all my surface flow pushing across the 5' area slowly to it. Also gets those small pieces of veggies Piggley make a mess with , no more scoop netting !
Take a look and this is on my 15 year old camcorder :
https://youtu.be/oVkrumqXt80With a glass tank you view from the side but sure it would help the surface are too. A stock tank view from top ! A clear surface is a must.