Hello i have 60 litre tank with a small amount of substrate i am new to keeping fish and my plants are not doing very well. they are turning yellow with brown spots. i have tried using interpet flora boost but it doesnt seem to have done anything. in the picture i have included the plant on the far left has had lots of peices broken off and are decaying does this add to my amonia? the picture was taken when the plants were new so they look healthy but they dont anymore.