75 Gallon

[Bill12]

Hi I am planing to put two to three deamon eartheaters in my 75 gallon with my Oscar and I am wondering about my substrate it is large rounded gravel would that be oxay for them if nesscary I could put some sand in ase the gravell thanks.

 

[onidrase]

get sand. I'm also not sure if your oscar will tolerate the eartheaters.