Hi Raul,
I think a little diet wouldn't harm them - that's the main thing I can see from your photos. Unless they're all full and ready to spawn.
In that case I hope you also have a willing 'tomcat'.
If possible you should show us some shots from aside.
Greetings,
Indina
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L18, L46 (+), L134 (+), L200, C. melanotaenia (+)