low PH

I have 40g reef it has 2 clowns, carpenter wrasse, diamond head goby, 2 turbo snails, 2 peppermint shrimp, 2 emarld crabs, and common star fish. They corals are several mushrooms, yellow polyps, several zoa colonies, ever green star polyps, Taro trees and a green toad stoll. 45 lbs live rock, mixed sand bed useing sand and crushed fla. agr. I have massive amounts of pink coraline alge. Back and one side is covered in it. My PH stays at 7.4, i test it of the morning about an hour after the lights have been on.
I dose 30 ml of marine buffer daily, about 8 oz a week. Any suggestions?
calc 440
magn 1350
dkh 8
phos 0
nitr 10
silica 0
iodide 0

 

where is your tank located? also are u running any glass lids or things of the sorts? if you are not getting enough gas exchange, trapped co2 in the water can bring your ph down. same applies if the room the tank is in does not get enough air circulation.

 

Tank is sitting in front of a window. Keep curtains drawn so no direct sunlight to keep down alge growth. The top is glass but i took the front lids off and replaced with eggcrate. Could i increase surface aggitation. I have 4 power heads in it, 2 on each side. Sort of 2 high and 2 low, 3 blast the front of the glass and 1 blasting the back.

 

would you happen to have a fts pic we could see?

 

No not at this time

 

pH fluctuates through the day. The net consumption of carbon dioxide during the daylight hours, leads to some aquariums to become deficient in CO2 during the day, and the pH rises.If you are having dramatic fluctuations you can aerate the aquarium water to degass excess carbon dioxide.

I try to stay away from dkH buffers as most people tend to use it too aggressively and end up making changes in the water chemistry in their tanks too quickly (in my opinion). I generally like to a change in the water chemistry happen very slowly over time. Usually a tank that has a lower dkH than desired took some time to get down there, it usually didn’t happen overnight. Conversely, it’s also not optimum to have it raised to the desired level over night. You can try stronger aeration in the aquarium water to degass excess carbon dioxide. For a permanent fix, I dose my tank with Tropic Marin Bio-Calcium which will very slowly, over time, raise the dkH to the desired level which prevents pH swings in the long term. Using a salt with a naturally higher buffering capacity may also help too.