That looks like the "el cheapo" from Wal-mart? We often read a Krylon but I think that all are safe ---IF we let it fully cure before adding it. It is my thinking that the volatile parts are what kills fish. Once they are gone the rest is okay.
Either way, I have used that paint on Filter tubing. Seemed okay for my work. I let it set for maybe a week before I got back to the project.