How much crushed coral to add?

[Coolysd]

Hey y'all!
My PH keeps dropping and I was informed that I can add crushed coral to help it. I have a 75g with 3 Dojo Loaches. I've never used it before so how much and where do I put it?

TIA!!

 

[Sgooosh]

put the crushed coral in a place with high flow or simply inside the filter.
it will slowly raise your water gh ph kh and hardness.
According to "aquarium science" and "aquarium co-op"
the water levels stabilize at around 7.8 ph
and you should add one pound per 10 gallons.
I've never added this much at once, so i think you should slowly add it

 

[Coolysd]

Wow that's alot and that much definitely won't fit in my 2 large HOBs! The water in my area is already super hard. Last time I tested (a few weeks ago) gh was at 388. Increasing it won't hurt it?
Any other ways to help the ph?