/www.google.co.uk/imgres?imgurl=http
/www.supa-aquatics.co.uk/uploads/products/full/171.jpg&imgrefurl=http
/www.supa-aquatics.co.uk/products/aquatic/aquarium-decoration/natural-ferns/&usg=__YjgQtvU7ZHUOpr3eMn8zkzJiaxc=&h=867&w=500&sz=90&hl=en&start=2&zoom=1&um=1&itbs=1&tbnid=9GxQT3ksJQf5CM:&tbnh=145&tbnw=84&prev=/images%3Fq%3Daquarium%2Bdried%2Bfern%26um%3D1%26hl%3Den%26rlz%3D1T4DSGI_en-GBGB343GB343%26tbs%3Disch:1It could get too stressed out to feed if you do that, and feeding while stressed may sometimes result in problems anyway. I think it would be easiest to try growing some Hygrophila (quite easy), or water lettuce. Maybe use a mix of not so buoyant foods (for the Tetras) and flakes for the Gouramis, or just sink some of the flakes.