ok, ray, what am i doing wrong here? i have a phrag ('katahdin
sunset') in s/h in a 4.5 inch translucent pot; it seemed very happy in
there, until i noticed it was getting wobbly and the new growths
started madly putting out roots. i poked around a bit last night and
the old roots seem rotted, and there's some awfully scary-looking
stuff that i think is *mold* in the bottom of the pot. am soaking
some primeagra right now (the smelly belgian stuff and am going to
yank it out and give it fresh medium and maybe even a fresh pot
tomorrow, and then try and bake/bleach/napalm the old medium for
future use, but what, if anything, should i do to keep this from
happening again? should i be periodically flushing with something?
i've got algae in pretty much all the s/h pots, but i don't care about
it if the plants don't; i think this is the first mold i've seen.
plants get flooded once a week and then a topoff in the middle of the
week if the reservoirs are dry. eastern windowsill in MD 6b. thx in
advance.

--j_a