Any opinions on my beta tank?

I have a betta tank (about 5 gallons) and in it I have:
-2 Amazon swords
-log
-1 betta
-snail infestation
-assassin snail
-a couple red rocks
-a hair algae issue (could use some advice on this one)
-the plants on the log
-a little bit of guppy grass that came in on something
-a lack of a lid
-I do use flourish iron supplements and flourish advanced supplements
-very hard water

I'm listening for other's advice on the hair algae issue. I have a 5 gallon with a bad issue. I've been manually removing alot of it and using API CO2 booster everyday. It has helped but the hair algae is still there. I also use Seachem Flourish twice a week for about 2 months now.

I had a white hair algae issue in my 5 gal betta tank too a while back!!! But it was not planted… just fake plants and decorations… heated, led lights, in tank tetra filter, and air bubbler, with black gravel substrate. The tank wasn’t fully cycled when I was experiencing the algae. I moved my betta into a 10gal cycled tank, and broke down the 5 gal and scrubbed everything w hot water and vinegar and replaced the filter cartridge and started over lol not sure this was the most efficient choice but it worked. I cycled the tank took about 6 months and then got another betta and added it and he’s doing well so I guess I did okay. I’ve been doing water changes more frequently than before and no algae so far.

Don’t use plant fertilizers in small aquariums . The fish are enough of a fertilizer for your plants . If you feel the need then use only a fraction of the dose ( 1/4 or less ) on water change day . I think those chemical fertilizers affect other things too and not in a good way . Just the opinion of a miserly old man that hates to spend money .

This is the dosage I use in smaller tanks.

This is for a 5 gallons tank that has effectively 4 gallons of water without decor and substrate.

I use Flourish.
Excel: quarter dose (5ml/10=0.5mlX4g=2ml/4=0.5ml) = 10 drops / week
Iron: quarter dose (5ml/50=0.1mlX4g=0.4ml/4=0.1ml) = 2 drops / week
Trace: quarter dose (5ml/20=0.25mlX4g=1ml/4=0.25ml) = 5 drops / week

Edit: correction on product name.