Strange Swordtail Behavior -Old or Sick?
Hi there, Sorry to bother you but I am hoping you can help. We have a mixed 15gal tank including some swordtails tetras and two clown loaches. Recently the oldest of the swordtail females – (we have had her over a year and she is at least three inches long & full grown when we got her) – She has started acting very strangely and stopped eating. All the other fish in the tank look fine and eat and swim normally. This one swims “frantically” around near the surface of the water with the top of her head just barely brushing the surface. I have not seen her eat anything for at least a week. She has gotten very thin, but continues to swim despite apparent exhaustion which occasionally has her drift to the bottom for a “rest” period. She then returns to the surface and sticks her nose toward the air again. We have both an internal Eheim filter (we live in the Netherlands so you may not know these brands) as well as some extra aeration via a bubble wand since the internal filter doesn’t aerat
