Hi all
Plants in this setup are clearly strugling.
The tank itself is imbalanced.U have shared the volume of the tank and the lighting over it but nothing about your photoperiod length, filtration, lifestock and maintenance regime .The plants in the pictures are not difficult to grow and keep healthy.
There are few basics U need to cover when keep a planted tank.First U need to be aware what ammount of time you are willing to spend in maintaining your tank.Depending on the time, you choose lightning intensity .The lower the intensity, the lower the demmand for nutrients and slower all develops. The narrower the plant list you will be able to grow.
Atm your plants are in distress algae is present too.The worst you can do is to increase the lights strength as this will increase the demand for all the rest of the nutrients.
You are in the right direction of using root tabs as the Ehinodorus species are heavy root feeders.Its recommended to reduse your light intensity(foil rings on tubes or just one tube) get some floating plants and reduse photoperiod to 6 hours.Try some complete liquid fertiliser too and increase the amount of water changes while removing as much debris and rotting leaves as possible.Clean the filters.
You can definitely turn things arround.
Regards Konsa