There are a few things that can bring it up (and down if you get it to high)but the one i used (and it worked) was PROPER PH 8.2 dont know who it is made by or if it is even that good of a product but it worked for me.
Its up to you but i would get that crushed coral out of the tank because they can trap trates and everything else(as you can see from your levels
), but i would switch to ls. You can get some sand sifters and never ever siphon again