I have a 25 gal with two 14w NO T5. All plants except the jungle vals are doing well. I have anubias, mayaca, amazon swords, windolev fern, java fern and anacharis... Jungle val has been there for nearly 3 months.. No new growth at all. Just old leaves some which have been yellowing and I have trimmed them... Lately, some leaves have some black outline on them. I rarely dose Excel and even when I do it's low dose... Any ideas? I am thinking of taking them out and leave them in a glass jar near a sunny window. Then after couple of weeks, float them in the tank.. If they recoup, then I shall plant them... Any help is very much appreciated. Thanks.