Hi butterflygirl again,
your ph at 7.6 is OK. Please do not make them PH SHOCK which would kill your fish.
Well, you need to find out what is ph from your water tap. If your water tap come out at 7.0 PH or higher, you might not need crushed coral. If you want your wather ph more than 7.0 you can add crashed coral mixed with gravel it would be great. Sand as gravel are nothing speical but the ph would be stable.
that s ok you dont want clown loaches in your tank LOL. but there is lot of diffrent kind of loaches 
, They are come from india.
HTH
Duncan
