You can use, used coffee, blended up banana peels and bone meal (you can make your own or you can use fish bone and blend them into smaller pieces). All below amounts (left side) are per gallon of medium. If you offset the seaweed and just use more banana, you should be able to grow for free...
FIM at 12/12 and 'GML top' (remove pair of uppermost leaves on each shoot as soon as they grow out stunting the growing tip) any leaves that you can cut the petiole, it'll slow them down vertically but will induce minimal stress (compared to topping). You can also crimp the growing stems to...