bonjour,

first my tank:


~ 200g (5x3x2high feet)
Light: 10- T8 32watts zoomed (flora+ reef-sun)
CO2: 20-30ppm
NO3: 10-20ppm
PO4: hagen say 0ppm
Fe : hagen say 0ppm
KH : ~40-50ppm
GH: ~ 60-80ppm
Substrat : flourite and sand...and fish waste compost
plants bubbling well

i use only, kno3 and k2so4 when i think is needed...
no Fe or oligo etc...

in the past month my CO2 drop... 20-25ppm to 5ppm
and my NO3 was at 0ppm

CO2 and NO3...back on track now

but now i have, some little stagnorn on the sand.
litlle tiny hair green algue on the mayaca and wallichii
and strange thing on the brasiliensis... (gray little spot)

can you tell me who is he ?
http://i11.servimg.com/u/f11/10/07/95/57/15mai_10.jpg

do japonica shrimp, ottocinclus or siamensis will help ?
whitch we do best ?

thanks.