Another way to control algae is to add more plants to the tank, so what was once excess nutrients is now being used by the new plants. Plants out compete algae for nutrients, but just like plants algae uses light for photosynthesis and feed on excess nutrients in the water.
As to dimming, I was referring to where you said something about adding the Planted+ to the tank...
You could get a Planted+, and suspend it above the top of the tank... 48" Finnex Planted+ PAR is 60 at 18" depth, and 25 PAR at 30" depth, so since your tank is 24" tall and with substrate leaves say 20" - 21" by suspending the fixture 4"-5" above the top of the tank should give you between 32-36 PAR which is what you want for a low light/lowtech planted tank.
As to dimming, I was referring to where you said something about adding the Planted+ to the tank...
You could get a Planted+, and suspend it above the top of the tank... 48" Finnex Planted+ PAR is 60 at 18" depth, and 25 PAR at 30" depth, so since your tank is 24" tall and with substrate leaves say 20" - 21" by suspending the fixture 4"-5" above the top of the tank should give you between 32-36 PAR which is what you want for a low light/lowtech planted tank.
