i bought coral sand ages ago when i was going for a malawi set up. then being told my 3 and a half foot tank wasn't big enough for the yellow labs i used the sand on advice from the lfs that my guppys and swordtails would be ok. i used the sand and everything is fine. i'm now getting another tank (free of charge from the mother in law thanks to advice given to me off here and doing 50% water changes for her every 4 days or so) now my question is i love the sand but really don't want livebearers in it any suggestions of what else would be ok with coral sand? the tank is 39" x 15" x 18" thanks alot.