If your fish are doing okay i say just water change daily till your ammonia drops. If your water is cloudy then your tank is already beginning its cycle again. for a 125 I would guess that 75g daily changes is okay, but monitor your ammonia and nitrites daily and watch your fish. If your fish seem okay and your parameters keep improving then keep it up, then space out the water changes gradually as the tank finishes re-establishing itself. If parameters dont improve or your fish dont improve and act normally (which i doubt but it is possible) then i would consider ammo chips or something along those lines
