I miscalculated the litres in my tank and dosed the tank 5 times too much. I lost everything except my keyholes, fighters, bristlenose and kuhli loaches.....grrrrrrrrr....anyway have rescued these poor fish and seem to be coping...... The algaew has gone a greyish colour so guess it is dying....should I retreat with the flourish....would really like to get rid of it before re-entering the fish...I should I clean it off the glass?