I took down my old tank yesterday morning and set up my new tank last night and was wondering when I could put the fish back in. I put the established filter back in the new tank (tetratec 1200) this afternoon about 2 hours ago to give it a bit of time in the new tank. I did a waterchange this morning as im using ada aquasoil and I heard it leeched ammonia for a few weeks so I will have to continue this everyday. Would it be too soon to addd them tonight?, the water is all heated up the the right temp and like I said its an established filter nearly 3 years old.