thanks guys. some personal observations:
- "bamboo" grows fine in most any water, including hard ph8 water where i live. just keep the water clean.
- tanks been set up for about a month now, with no change to the condition of the bamboos. most of the branching stalks in the 20g have actually grown out of the water by now. i'm not sure how they rot as i've never seen it happen. those submersed in the 50g still looks healthy and growing slowly. i'll continue to monitor their condition, and worst case scenario, can always reinstall with taller stalks and grow them the
traditional way. i've experimented on the bamboo before i started the tank idea, so i'm not really going cold turkey on this, i hope.
the statues are actually call 'foos dogs" in english, not sure exactly how they got this interesting name. i've picked these up at the asian markets in the Bay Area. and they're made of marble, so fairly inert and weighs down well in water. you'll find pages of these on ebay but watch out for the metal versions.
the dark sand is seachem's onyx sand. there's also a larger gravel version that they sell.
as for fish, i took up the suggestion for white clouds in the 20g. they look good! hey, design by committee.

the 50g is now housing a trio of japanese ryukins. i'm gambling that they won't chew up my hygros. i'll have photo updates in a few weeks to show the tanks and the status of the bamboos for those interested.