I have alot of algae. Can APT FIX / APT FIXLITE help?Updated a month ago

Perhaps. Both FIX and FIXLITE give plants a temporary unfair advantage against algae, and this helps them recover.  

However, plants that are already very weak may not benefit. In fact, FIX / FIX-LITE may affect them the same way as they impacts algae. 

In a very mature tank, the signs that your plants may be very weak include:

1. Very little, or no new leaves over long periods.
2. Widespread algae on leaves.
3. Melting leaves.

Overall they might still look 'OK' but are extremely fragile. In such cases, FIX / FIX-LITE might affect them the same way they impact algae. 

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.