So I have 3 striped khulies that have been in my tank for about 6 months. When I got them, they were extremely active, and were very fun to watch. But recently, they haven't been coming out very often, only for food. Another thing though, is that I was gone for about a month, and a relative of mine took care of the tank, and he only cleaned it out once. I clean out the tank every week, about a 30% water change. So, now that I'm back (and have been back for about a month) my kuhlis aren't very active like they used to! I checked the water, did plenty of water changes, and have been feeding them their favorite foods (peas and bloodworms). I don't know what is wrong with them, all of my other fish seem fine, and there are no physical signs of them being sick. I don't know what to do, I miss my fun little eels! Any advice appreciated!