Hi! Thanks for your suggestions! I'll defenitely try that!
I have two heaters in all of my tanks, except on my 9 gallon..
I'm just a bit paranoid about one giving up on me (I'll always have one running in that case) and also, it helps having the water temperature more even from one side to the other..
I forgot to say that I also add some root tabs near my crypts, so that might be why they are growing like crazy.. 2 months ago they were only half this size!!
Problem is with grass, I can't really have any in "low light" setups can't I?