Need help from Turkey - Fluval mega flex - filtering and purigen

[Sugosu]

Hello guys..Firstly i am really sorry for my bad english..

I have no any experience about aquariums until 1 week ago.just buyed a second hand fluval flex 32.5 g. 4 days ago. ( 123 liter )

My seller said he was using everything stock in filtering system.this is a 6 month old aquarium.also he added efheim 400 air motor.

My problem is my water has too much organic things in to the water and i have very yellow water.

yesterday visited a pet shop and they said use seachem purigen premium synthetic filter resin ;



This is my auqrium filtering system ;



i put this purigen filter to area 2 on the picture.

but problem is , this area is dont have too much water flowing.

this is the area.


this is my total filtering system photo



as you see there is an area ( triangle ) at left and right sides.do you recommend use this area for purigen filter?

or do you recommend any other things about filtering to this triangle areas?

also this triangle areas has too much organic thing at down side ;



also my main motor area has same organic things


when i buyed this aquarium also take 50 liter water from old aquarium.and added every day 10-15 liter water.

but as i said i have too much organic things in the water and also my aquarium water is so yellow.

this is the my aquarium




so i hope i explained my problems .. if who want help really thank you from now.

 

[Sugosu]

Hello again.i just take a photo from behind of aquarium.

and as you see my left and right side triengla empty areas has full of organic bad things.what you recommend about there?

 

[Blue Ring Octopus]

Can you run some carbon in there as well?

 

[Sugosu]

Can you run some carbon in there as well?

Yes , fluval filtering system has carbon