I just had to move a male from a 5 gal hex to a 2.5 gal. He is going blind, and also seemed unhappy in the 5 gal due to its height. The 2.5 is a perfect size for him, height-wise and footprint-wise. The smaller tank will make it easier for me to feed him if he goes completely blind, and he wont have such a hard time getting to the surface for air. He is a halfmoon, and seems to have a lot of trouble with his long fins. Hes always almost bent in half when trying to turn because his fins are so heavy lol. So hopefully the smaller tank will stop him from becoming a fin biter due to frustration.
Some people are just insensitive, and they are probably assuming that small tank=less care from you. Because if you can only afford a small tank, you must not care about your fish??? :*roll eyes*