I have 2 bristlenose in 2 different tanks. One is an albino about 4" tl in my 25 g, and the other is a calico about 3" tl in my 20g. My albino is out and about the tank occasionally during the day. At dinner time he comes out and sits patiently waiting for his food. My calico however is constantly hiding. Never see him during the day, and very rarely after lights out. I put his food in the tank and I never see him come out to get it. However, when I wake up in the morning and take the remnants out, it looks as if he has nibbled on it. I have also noticed the last couple times I was able to get a glimpse of him, that there is a little piece missing from his tail fin. Also his pectoral fins look a little frayed. But I didn't see any blackened edges associated with fin rot. I've had the calico for about 3 months now. The albino did a lot of hiding for the first month or so that I had him, so I expected the calico to do the same. However it's been longer, and it's making me nervous that he's hiding all the time. The calico I did get from a fellow hobbyist and the albino I got from a LFS if that makes any difference.
Water params have all been fine. No ammonia or nitrites, and nitrates are always below 10ppm. Tank is moderately planted with various anubias. His tankmates are 3 male dwarf platies, 6 glow light tetras, 2 endlers, 2 nerite snails, and 1 ghost shrimp.
Should I be concerned or am I just being overly paranoid? It took a lot for me to get this little guy, so I'm afraid to lose him to something I could've fixed.