I think a lot of people are missing the point of the glofish issue. Its not weather they could cause harm to any eco system or other animal. It is the simple fact that fish are living things, not toys to tinker with. When we start to modify fish, where is it going to end up? You can talk about the lack of bio diversity, or of the contamination of bread stock. (can you imagine how pissed off you would be if some of your fry ended up expressing this phenotype because 3 or 4 generations ago one of its parents was a glow fish?) But too many people think adding a gene is like turning on a light bulb. No, each action is a completely interdependent procedure. You add jellyfish DNA, who is to say that it doesn't change an immuno-response, or shortens the telomeres on the cell. Frankly there could be massive degradation of DNA and rNA that my not show up for years on end.
Secondly…What we have here is an evolutionary bottleneck. This is the big issue for ALL GM crops (at this point you might as well call these poor fish crops). These fish all came from one very small gene stock. They all are very similar. Look at other examples in the fish world about over bread/selected fish. The Dwarf Gourami, the betta, the angel. These fish because people have tried to select one trait over all others have basically led to the collapse of the entire captive breed. They are weaker than they were before, die sooner, are more fragile ect. The same is going to happen to these fish. It might not happen right away, but you cant argue that there is no historical precedent.
Thirdly…Lets face it…The majority of people who buy these fish are new to the hobby and don’t know much at all about fish keeping. (I am not talking about you Matt, and Im not attacking you in any way 8) ) They walk into the store and they see the massively bright unnaturally colored fish, and they want to buy them. It’s the same with the people who buy dyed fish, or neon pink castles. So most of the people who will be buying these fish will be keeping them in poor conditions, uncycled tanks and generally dooming them to a short or miserable existence.