Sorry pictures are a little cloudy (It's not the water. The water is crystal clear.
There's 3 loaches in the tank. These two - the right hand one is normal sized.
and this one is the fattest. Sorry it's a dark picture but you do see the shape of its belly.
They're all around 5inches long.
They do eat but not as ravenously as usual. They also swim chasing each other round the tank but not as much as usual.
125 liter aquarium. Ammonia=0, Nitrite=0, Nitrate=50 (Due a change), ph=6.5
The bellyshape looks that way - fat would result in a round belly, not this edged one. Further, if one fish is overfed, why would the others not be a little over? Assumng eggs would answer this question nicely.
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