Ill try to get a pic of him tonight. He always seems to come out blurry even tho he barly moves.
I think your right about the stress and the tail thing. Mine tends to darkin a lot when hes stressed too. I cant say Nipps always has his tail hooked because Im not there watching him all the time...unfortunatly
Sometimes its straight with his fin extendid, sometimes his fin is collapsed. othertimes his whole tail is hooked. But his side fins are always going like a humming birds.
A long time ago I had a FW GSP that was the size of a pencil eraser and he used to use his tail like a seahorse and hook to plants and such. Who Knows. They are cool little guys tho.
Have you ever been nipped? I have. little buggers got some chompers!