Endler doing loop swimming patterns
I have an Endler that we noticed was looking quite pregnant 3 weeks ago. 7 to 14 days ago her gravid spot would appear go away a few times in a day. During this time she was in a 56g tank that had 3 upside down catfish, male endler, 5 corydoras, 3 otocinclus and a few cherry shrimp. She seemed to be quite calm and would stay near the bottom when she wasn't looking for food.
A week ago she got even bigger and the gravid spot hasn't gone away since. 5 days ago I put her in a 10 gal tank for her to give birth that also has 3 otocinclus in it. She seemed to be quite calm for the first 3-4 days. Last night and this morning though she is repeatedly doing loops at the front glass surface from the bottom to halfway up the tank and back down. All 3 otos are also at the front of the glass resting on the substrate; she swims right by them as if they aren't even there, so I don't think they are bothersome to her. She has been fed. I fed her again and she goes towards the food sometimes, but doesn't eat. any ideas why she is so active, it looks like she wants to find a way out or something.
You say you have a male endler as well as a female endler, perhaps the male is the father and the pregnant female is trying to get to him...
It's probably stress from the move. Her gravid spot may well disappear as well if she's too stressed. If you can cover the tank or keep the lights out for a while, it will help.
Also check the water parameters.
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