Forgot to put a backing on a 62g before setting it all up right against a back wall, then realising I couldnt move it to fit it! Also found the floor wasnt level with this tank and had to completely move it to another part of the room.
Forgot to add dechlor to a tank that I then put mature media into - luckily no problems afterwards.
Forgot to add dechlor to a tank that I then put mature media into - luckily no problems afterwards.