One stressed Molly?

Molliesaregreat

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Hi everyone, this is my first post to the forum: I have a 120g tank 5 x 2 x 2, which I moved the fish from 2 tanks into

So it currently has
24 tetras (neon, black neon and harlequin)
About 20 or so mollys
2 gourami's (a honey and a snakeskin)
2 bristlenose (baby and a fully grown
1 synodontis multipunctatus
1 random pleco (not sure what type but he's cute though, the fear that he might grow massive is what prompted me to get the big tank)
3 Zebra loaches

I've just finished moving everyone in there over the course of a month of so. But had an issue with one of the molly's after he went in. Shimmys, hiding.

I moved him into the hospital and treated him with interpet anti-internal bacteria, as soon as he went in the hospital he was absolutely fine, and after 4 days of treatment + 4 days in there I decided to move him back about 2 days ago.

Since going back he's spending most of his time hiding under a rock at the bottom of the tank. He's not shimmying at all but he seems very low energy a lot of the time. When he is out and swimming there are no problems

He doesn't appear to have any spots or lesions, bloating or problems swimming, but maybe appears a little bit pale? It's difficult to tell because he was always a lot paler compared to his siblings. His appetite is good (he had cucumber today)

I've seen him swimming about with his siblings earlier today but it seemed that when he saw me he went and hid. When I feed him he'll come out to eat, swim around for a few minutes and then take himself back to his little hiding spot. There is one other adult male in there but no aggression in the tank.

I'm not sure how to deal with it, i'm wondering if he's just going to take a few more days to adjust? Some of the others from his tank did hide away for a few days. Has anyone experienced similar issues? Any recommendations? The water parameters are fine.
 

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Can you provide more details on the water parameters? Specifically GH, KH and pH (with numbers and units)
Mollies are hard water fish and cannot live for long in soft water. All your other fish are soft water fish and won't do well in hard water.
Shimmies can be triggered by water that is too soft or acidic, as can clamped fins which your fish has.
 
Synodontis multipunctatus needs really hard water with a high pH. They come from Lake Tanganyika, which has a GH between 350-450ppm and a pH around 8.5-9.0. They need to be in groups of at least 6 (preferably 10) or more and will eat the tetras when it matures.

Check your water quality and make sure the GH is 250ppm plus for the molly.

Ideally you will get a second tank and have one for the soft water fishes and one for the hard water fishes.
 

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