still working on pond waterfall Left to do put underlayment then liner the large rock on left can i use silicon to glue liner to the rock will leave extra for water level i only need 8 feet the 20 of tubing should i cut the remaining hose also can i put underlayment and liner over my first foundation Stones then tocks on top or should i remove rocks ad more soil to sides to raise to water level then lay underlayment and liner then stones just dont want to remove rocks again with liner down to do it over again because i changed mind again about rock layout/ design furst photo is preformed already in with water