From what I read, water is treated, 50% wc daily, with sponge filter, not over crowded, feed little, etc.. You should not have problem.
You feed tetra bits, isn't it for Discus? I ever tried feeding tetra bits to my culls and the water get dirty very easily.
Males eat little, FBW is enough to keep them full, tetra bits mayb a bit too much for them. Flakes mayb a better choice.
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