I have a small tank with 4 danios - 3 of them "glow fish" - a bright neon green, yellow and orange. The fourth is a fancy zebra. The green and yellow fish are quite tiny and their bodies are becoming bent in the middle. They seem OK - they eat normally and swim normally, but I was wondering if anybody knows why they're getting bent. Thanks in advance for any info. (And Happy New Year! - I haven't posted in a while...)