best substrate for tang eels

[proaquatics]

crushcoral sand or just reg sand?

 

[killerfish]

they would both be fine crushed coral would help change the water to better suit them

 

[proaquatics]

help change the water how is that possible?? thats my job i didnt know rocks could do that job haha a load of my shoulders so kidding mmm i thought tang eels are fine in 7.0 ph??