....................On second thought, after investigating further I think the "skybogs" will become "up"-scale annual planters. The root systems in the bogs - both the pea gravel and the lava rock - are so thoroughly grown in that it's a wonder the water was able to flow at all! I'm thinking now about putting maybe three pots (to keep the root systems contained,) of creeping Jenny in-between some tall-ish colorful annuals. We'll use the same watering system, and some more substantial soil, but just crack the valves every other day or so for a minute or two until the soil is sufficiently damp, rather than have the water flow constantly. This will render the return piping superfluous, but I'll leave it intact in the event some other "bright idea" comes to me in an epiphany.
On another subject, cleaned out the main bog of all surface growth and an amazing amount of surface feeler roots yesterday. There remains plenty of sub-gravel roots to start next season, but everybody was so over-grown the water level was rising to the point of over-flow. The Iris was a real nuisance to haul out, but after some cautious digging (being extremely careful I wasn't near the liner,) got most of their root systems out. I'll pare them down and re-plant a few, but won't let them go for three years again!
The water flow has increased dramatically although there are four frogs that are decidedly annoyed that their havens have been destroyed.
Just a few more items to tend to - put up the leaf net, haul out a floating island, and in a month remove the items that a hard freeze would damage, - then put the table and chairs away at the last minute when it really turns cold.
Still time for one or two more evenings though............