this is a very very bad combination.
the pleco is sucking and feasting on the goldfish hence the lost of scale.
as for the swordtail, it might be other problem and after it was dead, the pleco was feasting on it.
This is regarding the 2ft tank which is already cycled. Dimensions are 2ft(L) X 1ft(W) X 1.5(H). This tank had 1 goldfish, 2swordtails and 1 pleco.
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