Did I miss what you are using as floaters in this tank??? in my Asian tank, the Tin Foils & Gourami, are pretty hard on plants, so I have emergent Lucky Bamboo as the main plant, I think it works well... but I tried to introduce Asian Water Moss, but the bigger fish over grazed the roots, & I could never get it to take... currently I have Water Hyacinth in that tank, & the roots are still getting over grazed, but it's a tough & durable plant... My African tank, is also a high flow tank, & plants like Red Root Floaters & Frog Bit, did not do well with the water flow... the Water Lettuce & hyacinth grew very well, but were more maintenance than I wanted... so I have some Asian Water Moss in there now, & that looks like a winner, after trying 6-8 different varieties of floater...
this is the water moss... Asian Watermoss, Salvinia cucullata