Single white spot on cardinal tetras, help diagnose please?

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Firesong

Aquarium Advice Newbie
Joined
Aug 8, 2020
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1
Hi,

Am new to this forum but came here to seek some advice. I have a 75g dirted, planted tank which completed a fishless cycle, was left for 3wks to ensure stability. I had 15 cardinal tetras in a 1yo tank which I transferred to the 75g about 2wks ago. Solo occupants of both tanks except pond snail hitchhikers from plants and 2 assassin snails.

Temp is 80-F and water parameters good for ammonia/nitrites/nitrates(0/0/0) Eheim 2217 filter, air stone.

Today I notice half of them have a single spot on their causal fins. It doesn’t look like ich. The other half have no spots. I enclosed some photos.

Anyone able to advise what this is? Just in case it is very early ich I am starting to raise temperatures now. (And where could it have come from??)
 

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It looks more like discolouration of fin (so would think early stage fin rot from stress / water chemistry off spec). Sometimes it can be natural colour change. Water tests and water changes may help. Anti-bacterial treatments if worsens.

It doesn’t look like a growth (pimple shape) I think (from iPhone).
 
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