Thanks for your support zeon! haha that day waited 30mins, sorry if offended u 

have you all see a sick marimo before?

Erm...the sick i mean is half dead half alive marimo 
Tml i will post the pic to show you all 

welcome to the club 

try squeezing it when u clean them n change the water.
they might float as some oxygen stuck inside the them? haha

for normal photosynthesis, it will be very hard for them to float.
limited light source + remember no sunlights.

i guess it depend on the amount of water also.
if the water level is too high, they might just float half way

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Added on June 1, 2011, 6:39 pm
yeah but not that 'susah' also.. need some experience then we'll be alright? 
i plan to rear lower grade shrimps 1st, after i cycled my tank.

hardiest shrimp 
hmm where to buy glass shrimp? 

Most LFS sells them as feeders lol~