Use of Seachem Flourish Excel in aquaria containing fish dangerous?
I recently read the following statement made by a highly respected individual with much experience in the keeping of freshwater fish and who's opinion I certainly value, and I quote "Seachem Excel contains glutaraldehyde or cyclized glutaraldehyde. This is an aldehyde which binds to proteins. Formalin, which is a severe tissue toxin and is used for specimen preservation is also an aldehyde, such as glutaraldehyde, so I find its use in aquaria dangerous to say the least."
Could you please clarify the matter?