Posted a few weeks ago that I had algae and I wasn't sure what it was.
I think it's called Staghorn.

Finally. I tried what some people said. I soaked in bleach and water
everything that had algae growing on, through out the plants that were
affected badly. Reduce the amount of light in my tank to almost nothing
(just during feeding time and when I wanted to clean and see my fish
that I had it on!) and now, I seem to have killed the hard to get rid of
algae! I think I will set up a DIY Co2 thingy because my plants look
like crap now.

Thanks to the people that helped!

Regards,

Marc