Why my moss isnt growing

Not sure what moss you have, but assume it is Java Moss. It is very slow growing (a good thing) and should be attached to driftwood and not to thickly giving it good water circulation and time to spread. Once it is established a slight trimming usually allows it to fill in nicely and although it is low light a medium light will usually grow it faster. I find that mine seems to grow best attached to rocks or driftwood. Planting it in substrat it tends to get a lot of debris in it and looks unsightly. Trimming it keeps it low and the new growth looks good. I also found my java ferns grow faster. Just be patient with it.

but it seem not to be growing at all because i have valls americana that sends runners faster that the java moss grows i used liquids fert and tablets and i have 120 watts right now and the aquarium is 20 gal

Do you have Siamese algae Eaters in the tank?

I know that mine like Java Moss as a snack and keep mine from growing at all, I have a thread that I posted a while back about it and there were a few others with similar experiences.

Thread is here:
http://www.aquaticplantcentral.com/forumapc/fish-planted-aquarium/51738-sae-s-eating-my-java-moss.html

I have siamese algae eaters too, they do not eat my java moss. I do notice that you have a lot of light with that amount java moss grows very slow. Maybe you can have another plant shade this one so it will grow. I hope with that amount of light you must have your ferts in control or you will have an algae nightmare.

R33 GTR said:

but it seem not to be growing at all because i have valls americana that sends runners faster that the java moss grows i used liquids fert and tablets and i have 120 watts right now and the aquarium is 20 gal

Click to expand...

That's too much light for moss. Moss doesn't like very high lighting situations. The best way to grow super healthy lush moss is to use medium lighting, cooler water and good water circulation.

AaronT said:

That's too much light for moss. Moss doesn't like very high lighting situations. The best way to grow super healthy lush moss is to use medium lighting, cooler water and good water circulation.

Click to expand...

This has been my experience as well. Even in medium light intensity, my Christmas Moss looks better (better form) when shaded by the large leaves of my swords than it does where it gets full light.

-Dave

I don't know, I know people that grow moss in tanks with high light without any problems, and its not like you would want to go out and get a new light fixture with LESS light just to grow your moss. It may be you piled the moss on too thick. Also if it was commercial grown moss, it was grown emersed and it takes a while for it to grow out under water. I have found moss can be very slow to grow out in the begining, like a few months before something starts to happen. Once it gets going it grows much faster. I would just give it more time.