from your original post, it looks like you only have 1 cichlid in the 55g right now? just feed it normally, and measure the params for a few days. If your nitrate starts going up but ammonia/nitrite remains 0, then you are cycled with 1 fish.
Keep in mind even if it's cycled, you are likely to see ammonia spikes when you add more fish since the bacterial required to deal with 1 fish isnt a lot. So add fish gradually, instead of all at once.