What is this??

[Welsh]

I found this in my betta's tank last night, I have no idea where it came from. At first I thought it might be Java Moss, but it doesn't look anything like it -- I assume the JM is the smaller piece in the photo, if so, again I have no clue where its come from.

Another thing...I have Java Fern under a high light --7wpg. I've never been able to keep JF before, as it always turns black and dies, but it seems to be doing amazing in the tank, where as anubia's turn a lighter green, but darker when I put them back under low light. Basically is C02 essential under a light this high? Obviously I don't want Co2 on such a small tank, but I also want live plants in there as I have a lot of anubia's and crypts, is fertilizer alone going to do any good?

Thanks

 

[Fdsh5]

Kind of looks like najas grass aka guppy grass to me

 

[Welsh]

Really? I thought guppy grass looked like hair grass.

After researching 'aquarium grass' online, it seems to look similar to Riccia.

 

[Fdsh5]

Tough to tell from the pictures. It looks different floating in the tank. It probably was a tag along in your moss. I get those some times. Last time my wife bought some plants we acquired a bamboo shrimp hiding in the bunch

 

[BigJim]

+1 for it looking like guppy grass.

How big of a tank are we dealing with here and what kind of light? The Wpg guidelines don't apply well to large or small tanks.

Java fern will grow faster in a medium light tank, but it seems to slow down with any more light than that. My java ferns exploded when I put them under some decent CFLs.

 

[Welsh]

It's pretty small...17 liters.

When they were in my low light tank -- 1.2wpg, most of the leaves were black, and I dosed with the same fertiliser as I do now -- Flourish Comprehensive, but now they are a nice green, and they don't feel thin and brittle.

 

[BigJim]

17L (~4.5 US gallons) is too small to follow the Wpg guidelines very well.

 

[Welsh]

So basically, I can just throw in any plant? lol