SO i went a away for four days and came back to my entire pond covered! we had 4 water lettuces and now over the past month the whole 15 ft by 5 ft pond is covered, which is great to me, however, bot they are COATED in aphid like little bugs! it looks terrible and im worried about the rest of the yard.. anything you guys recommend besides taking it all out? thankfully the lotus's are planted in a upper and separate part and not coated... thanks