I have had 7tetras 6 guppies and one shark die due to white spot (well im positive it is white spot) I have added wunder tonic to the water yesterday but am wonder I have an aqua one filter am I ment to take the carbon out and just leave the sponge in? I have put the temp of the tank up today one shark died and one sucker fish any advise would be great I am new to this :-D