totziens

This is not a NPT specific topic but since I keep ferns in NPT as well, so I decide to post it here. Regardless I use NPT or non-NPT method, the problem is the same. Below is one example from my list of tanks.

I have been keeping plants over the years. Somehow ferns which are claimed to be the easiest aquatic plants always give me headache. I have been trying all kinds of method to overcome it but I have failed so far. Sometimes I even get contradicting advice. Example: some people told me to increase the light exposure but some ask me to decrease. Some claim that my temperature is too high but I have seen a friend who dumps her narrow leaf fern in a pot at the balcony without any fan or chiller...and she had no problem at all. Please help to identify the problem. Recently, due to the following tank broke, I decided to use ADA Amazonian soil but I doubt it will make any difference for ferns.

Problem:
Java/Phillipines/Narrow leaf ferns turn bald after several months or 1-2 years plus OR taken over by green spot algae.

Tank Size: 3 feet or 50 US gallon

Lighting: 144 watt of PL totally. Turned on for 8 hours a day. To be exact I turn it on for 4 hours, turn off for 1 hour, turn it on again for 4 hours

Filtration: Eheim 2215

Water temp: 28-29 degree Celsius even with a fan (82.4 - 84.2 degree Fahrenheit)

Fertilisation: Seachem products - Excel (whenever I see BBA only), Flourish (slightly less than a capful per week), Potassium (1 capful per week), Nitrogen (half a cap), Phosphorus (1 capful per week, started only last week), root tabs and ADA's iron are added once every 6 months (this is an estimation).

CO2: 3 bubbles per second

Substrate: Holland sand (added a packet of ADA Amazonian soil only yesterday)

Fauna. species & number: SAE (1), Ottos (6), Yellow Phantom Tetras (6), Cherry Barbs(maybe around 10), Kuhli Loach (6), Ember Tetras (about a dozen). I think it's overloaded

Flora: Anubias Nana, Subwassertang, Marsilea, various Crypts (i.e. Wendtii, Retrospiralis), Cyperus Helferi, Narrow Leaf Fern, Philippines Fern, Java Fern and Eleocharis Vivipara.