How do i lower the PH>? and will these go together?

[ilovemysubie]

I set up my 90gallon tank yesterday because in a few weeks i am getting Acestrorhynchus falcatus ( red tail barracuda) I checked my ph and it was like relaly high 7.6 and for the barrricuda it has to be like around 6 so how can i lower the ph... or will it lower its self one the tank is settled since itwas put up yesterday??

Also will a bala shark, gaint Danio get along with the barricuda.

 

[Yanbbrox]

I set up my 90gallon tank yesterday because in a few weeks i am getting Acestrorhynchus falcatus ( red tail barracuda) I checked my ph and it was like relaly high 7.6 and for the barrricuda it has to be like around 6 so how can i lower the ph... or will it lower its self one the tank is settled since itwas put up yesterday??

Also will a bala shark, gaint Danio get along with the barricuda.

You can get an RO machine which will give you water around 5.8-6.2.
Depends on what you have in there, when I started discus a while back it took me ages to work out the obvious, the gravel was increasing the ph in the tank so no matter what ph water I put in there it would shoot straight back up again.

I've kept bala sharks in low ph water in the past with no problems, I've never kept a barricuda so I can't comment on tank mates