PETA is not stupid, this particular idea is stupid. PETA's overall aim is give animals rights. Considering we are all animal-lovers on this site, to one extent or another, you all should appreciate the idea that PETA wants your fish to have the legal right to be properly cared for, or not confined to tanks that are cruel/ too small/ overstocked.
read up on peta young grasshoppers, they've pulled the wool over your eyes.
ps, peta doesn't want your fish to be properly cared for, they want you not to have any period
http://www.peta.org/issues/Companion-Animals/fish-in-tanks-no-thanks.aspx