you can usually test rocks to make sure that they won't affect your ph by pouring a couple drops of vinegar on them to see if it bubbles.
i ended up using a couple dozen neon tetras and a few zebra danios to cycle my new 46 gallon, they were all gone less than two days after i put my new piranha in there... nothing like spending 30 bucks on two days worth of food, hahaaqua-man;1782079; said:Still cycling lol. Went out a bought 12 more zebra danios. That puts my cycling fish count up to 24.