went from gravel to sand - cycle?
I've had a tank running for around a month and a half. Yesterday I changed the substrate from gravel capped with dirt to sand capped with dirt. Do I have to cycle my tank again? The filter was off for ~2 hours, so I'm hoping that the bacteria in there is, for the most part, ok. Should I expect doing daily water changes until my ammonia/nitrate/nitrite levels are ok (according to tests)? How long would I have to do them?