Male Platy With A White Spot On Tail Fin

If the spot is in the same place on both sides of the fin it is unlikely to be whitespot. I have seen this on my fish from time to time and the only thing I could think of was a scar or, a better word, the fish equivalent of a scab. He could have caught his tail on something or even been bitten by another fish (one of the females getting fed up with him perhaps). Whatever the cause, it never lasted long when my fish have had it, so I suggest keeping an eye on him for now. If it starts to get worse, we'll have to think of something else.

Just to update you, the White spot has gone, it has been getting smaller over the last few days and has now totally disappeared.

Thanks for the advice.

Anne