My 90 gallon tank has a 40 watt light strip. I can't afford to upgrade the lighting at the moment but I would like to get some plants in there if I can. I do have some Hornwort which seems to be surviving although it makes a mess. In my 10 gallon I have a Sword that has taken over and I would prefer to transfer it into the 90 but haven't because I assume it would die. It seems such a shame to have to throw it out though. My question is what if any plants can survive with such low lighting?