Aquatic Greenhouse?

     I was thinking about setting up some tanks to grow aquatic 
plants, not as decoration, but for propagation.  Seems like myself 
and my friends can never find good plants at reasonable prices 
(without driving 30 minutes away!).  Anyway, anyone have any 
suggestions on setup (esp. filtration and what, if any, fish or other 
critters would be benificial) for this type of setup?  Especialy need 
info on potting and filtration.  Any ideas or suggestions for my 
little project?  


p.s. for those who remember, the hydra are still with me and doing 
quite well...
 Patrick McClintick        |
        //                 |     
 o/////|+================> |     
        \\                 |   I'm just a sucker with     
 druid at accessus_net        |   no self esteem!
 HTTP://www.wp.com/druid   |
 HTTP://www.accessus.net   |
       /~druid/home.html   |