The algae is gone but my leaves do not look healthy?Updated a month ago

As a general rule, old leaves do not recover as plants channel their energies towards new growth and naturally discard older stems and leaves. 

You can rid the older leaves of algae, and delay their deterioration, but the leaves will generally not regain coloration or sheen.  

For most aquatic plants, long term maintenance requires routine replanting of the healthy tops, and removing old stems and roots. Read more about this aspect here.

For stem plants, this comprehensive guide will walk you through how to grow them well long term.

Old leaves that are deteriorating are big algae magnets. Plants abandon old leaves and focus on defending new growth. Old leaves have limited capacity to recover once they start to deteriorate, and it is better to cut off these old leaves and allow the plant to channel energy to new growth. It is not worth treating all the deteriorating growth with algicide as deteriorating leaves will not recover in the long run even if the surface algae was removed.