As long as they are not melting then should be OK
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Guessing this is Eleocharis 'mini' and considering possible small change in colour from camera used...........this look pretty much like the colour to expect from Eleocharis 'mini' ; a quite bright, light green colour leaning a bit towards yellow-"ish".......
- I would really not be worried as long as it grow as supposed .
yes brah! its eleocharis mini from tropica!
it usually turns yellow at the tips and melt off too?
It doesn't sound like you're dosing a very high level of ferts. Make sure you're dosing enough NPK.