A while ago I coverted an old Aquarium into a growtank for a few of my lowland Neps. It has lighting from tubes at the top, and heat/humidity from a heater which is in about 3 to 4 inches of water at the bottom of the tank. The plants stand on upturned pots so they are not sitting in the water. The humidity is constant as is the temp.
My ampullaria really loves the conditions, but others like mirabilis, gracilis & distillatoria are not happy. The growth is soft, sappy & goes prematurely black! [img]http://www.**********.com/iB_html312/non-cgi/emoticons/sad.gif[/img]
I am guessing that the plants are just too wet & humid. I have read about people adding fans (such as computer fans) to increase air movement. Might that do the trick? Is it a good idea using these fans in such a wet atmosphere?
What else might cause these problems?