Ok then, I apologize for not knowing that, but will now never forget
that....

ok, so 23W over a 5 g, is 4.6WPG, and that is WAY high....in my 5s I have a
12W T5 that does wonders...

It sounds like this is a new tank, and it's common for this to happen.. I'd
suggesting being more patient, and relaxing the fertilizers for a while...
doing water changes every other day to keep the green water down, reduce
your light, slow the feeding and wait... I'm going thru some green water
myself, and so far, it's looking better, every day, clearer, less green,
plants are going great... just wait...

My advice, after the green water is gone....
1 Weekly water changes maybe 1-2 liters, get into that routine....
2 no more fertilizer, you're only feeding the algae... resume after water is
stable
3 cut your lights down to less than 3WPG watts per gallon, 2-2.5wpg would be
good
4 light duration can be, but not to exceed 18hrs, 12hours is best...

I'm by no means an expert, but have been shown by many people here that it's
more of a patience issue, most humans don't have it, but most parents do...
haha...

"SIBIETA" wrote in message
...
It´s a 20 liters tank = 5,2 gallons
"RedForeman ©®" escribió en el mensaje
...
Hello everyone, i need some help with my 5,2gal tank. I`d like to know
how
much light is good for this tank with some elodeas, a ludwigia, and
some
other plants. I use a 23w light right now and i use sera`s products to
fertilize the plants and there is a lots of algae invading, mainly
where
the
direct light is.
I have to say that i change 50% of water every 2 or 3 days.

First, I'd say that I'm not sure what a 5,2 tank is, is it a 5g, a 2g, a
5.2g a 52g???? and 23W of light is a bunch o light for any tank less
than
10gallons.... first I'd suggest cutting the ferts until you figure out
what
you really are adding and whether it is really needed???

CO2? DIY or injected?? If none, you really need to cut back on ferts...