Your statements as to the nature of Glofish™ are not entirely correct; moreover, concern with the general ethicality of marketing genetically modified living organisms developed for non-scientific purposes is the primary rationale for aquarist refusal to purchase Glofish™. Glofish™, per se, were never used to detect pollution in waterways; whereas their predecessors (as with they,
Brachydanio rerio - zebra danios, a common laboratory subject and popular aquarium denizen - infused, while eggs, with jellyfish fluorescence genes) were modified to specifically "respond to the presence of chemicals like oestrogen through the estrogenic promoter and heavy metals and toxins through the stress-responsive promoter" (from
http://www.nus.edu.sg/corporate/research/gallery/research12.htm). Glofish™, on the other hand, have been engineered to display the "fluorescent coloration" continuously, independent of any environmental triggers.