i only wrapped the submerged walls. not sure what brand weed blocker i have. i bought it at home depot for like, $8 i think. it's a roll of like, a million yards....lol i actually would have preferred to use mosquito netting. but i didn't feel like trying to find it around here, and i had this stuff lying around. i am actually a bit concerned about stopping the flow, which is i why i said that i'll find out if it was a mistake when i do water testing this weekend. if it does stop flow, then i will probably double up some fiberglass screen to keep the juvenile shrimp out. and the fish i plan on putting in there breed very readily, so i don't want the fry to get behind it either, so i can remove them.