Crushed Coral .v. Crushed Sand - Same?

Hi all is Crush Coral the same us Crush sand do they both raise your KH to put in a media bag to go in a external filter please

Although they're the same, you don't want to put coral sand in a filter because the filter will struggle to pull water through it. If you're putting it in a filter you want coral gravel.... or dolomite...

I have crushed coral in the internal filters of both my 125l community and 45l shrimp tanks. I use a muslin bag (from a Home Brew shop) to contain it. I had a ph crash whilst cycling  the 125l, which I luckily caught before it stalled the cycle. This was the reason for eventually adding the coral. My tap water is kh 2-3, gh 3. The crushed coral has increased both to kh 4-5, gh 5. My tap and tank ph are 7.6 (both tanks). All measurements are with API liquid test kits, which I wouldn't be without!

Very occasionally, I detect a slightly reduced kh or gh. I correct this by adding a "mini" Aqualibra mineral block (Amazon). These contain various minerals and nutrients including calcium, magnesium, carbonate and bi-carbonate. My amano shrimps in the 125l are attracted to these. Each one  "dissolves" in about 3 days.

                    Skittler

@fcmf  It's been in there (125l)  over 3 years - although I have added to it once to increase the effect. I simply rinse the muslin bag in old tank water at w/c. It sits on top of the white poly-pad, there is just enough space for it in my Juwel filter.

                           Skittler