If it is the liquid ammolock product, it works the same as Prime and is safe. It ionizes ammonia (NH3) into the less toxic form ammonium (NH4+). Ammonium will be utilized by the biological filter in the same way as ammonia, but with lower risk of damage to the animals. You should absolutely keep doing large daily water changes, but I see nothing wrong with using this or Prime in conjunction with water changes to reduce risk of harm to the animals, especially if attempting a fish in cycle. The ammo chips, which go in the filter, will bind to ammonia until they are full, and will make the ammonia unavailable to your filter bacteria, so I would not recommend that product for a healthy balanced tank. Also you are likely to have ammonia spikes when the filter chips have reached their saturation point and no longer bind any ammonia.