i have recently(8 days ago)treated my tank with esha gastropex aquatic snail treatment and ithought that was the end of them bloody snails?but i have just started seeing them again?not as many but still there?in the instructions it says repeat after 14 days?can i retreat now or do i have to wait 14 days?please some one help ive had enough of snails knackering my plants? jek69