Do not add any leaves, it won't help his breathing.
Do a 75% water change every day until the air clears and there is no more smoke.
Get a box filter from the pet shop and put "Activated Carbon" or "Highly Activated Carbon" in it. Rinse the carbon under tap water first to remove any black dust. Run the box filter in the tank along with his normal filter until the fires have finished and there is no more smoke. The carbon will help remove the smoke from the water.
Put a towel under the air pump to help filter out smoke and stop the pump pumping smokey air into the tank.
Do a 75% water change every day until the air clears and there is no more smoke.
Get a box filter from the pet shop and put "Activated Carbon" or "Highly Activated Carbon" in it. Rinse the carbon under tap water first to remove any black dust. Run the box filter in the tank along with his normal filter until the fires have finished and there is no more smoke. The carbon will help remove the smoke from the water.
Put a towel under the air pump to help filter out smoke and stop the pump pumping smokey air into the tank.