I was a bit like you, my tank was a mess to start with.All the plants were covered in this brown muck and the gravel was all brown and yuck, and it didn't look very nice at all.After a while though with alot of water changes, some triming of the plants and about three months have gone by and it now has started to look much better, infact it looks like a river scape and my fish and plants are starting to grow.Time is your friend just let it be for a while and you will see.