I'm cycling a 120g by ghost feeding. I've been adding 1-2 cubes of some crappy frozen fish food by fish hate. The ammonia quickly rose to .50ppm after the first day but stalled and is now at .25ppm. Should I be looking for a larger spike to come or was that it? Keep in mind this is a system with no live rock, I did add about 15g of water from another tank when senting this up.