Watch out guys, Crackdown and Fendona both have only one warning: Deadly to all aquatic life. I recently had my house sprayed with "super safe poison, including fish and aquarium life" but after searching (very little) on the web I came across the official information for Cackdown and Fendona as above. BASF Safety data sheet according to Regulation (EC) No. 1907/2006 Product: FENDONA 6 SC (ID no. 30278853/SDS_GEN_GB/EN) Date of print 06.02.2013 Possible Hazards: Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. May cause paraesthesia. Crackdown : 2) HAZARD IDENTIFICATION OF THE PRODUCT Risk advice to man and the environment: Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.