@Don, i'll post pics of the setup tonight
the rain system will be on it's own timer. I will adjust it throughout the year so that i can replicate seasons for the orchjds as well as to simjlate breeding conditions, if possible. The water will be tank water recycled. The pump is under the false bottom along with a heater and the submersible filter. As far as the silicone sticking to the vinyl, it will stick. Silicone adheres to almost anything except cured silicone.
@yukon, thank you, even i am curious to see how this turns out.....lol