i am having problems with my kyoto grass i was trying to grow, they came in pretty green now they are losing color and looks like they are dying, what could be the possible problems because my sword plant on that side keeps getting brown also, i have used pro plant iron supplement and do 25-30% water changes every week. i also have a sand substrate so should i use a different plant food or a fertilizer to help my plants grow. PLEASE HELP...

With regular fluorescent, you want to go to 250 W or more. Also, you need to prolong your light period to 12-14 h. Looks like you need to get some more lights. When I had my 80 gal, I ran 4 full-length bulbs ... that's two double light strips
The things you do for groundcovers ...