Bad news today unfortunatly, i noticed it yesterday and when i woke up this morning it hadnt changed, one (possibly 2) of the discus is turning dark in colour, very dark, it is fairly constant, other than that it has no other symptoms that i can see of, it is still swimming fine and eating healthily. The poop that collects at the bottom of the tank before i siphon it out looks fine, it is dark and solid.
Without jumping to conclusions i think it may be parasites, and if it is i would like to treat the whole tank for them as they all came in in one batch.
I have been keeping up with my 60-75% water changes daily feeding one cube of brine shrimp and siphoning out the leftovers(not much) .
I wanted to post it here first before i posted it in the emergency room section as people who are following along with the thread know whats going on in the tank.
I have just done a waterchange so i will test the water in the morning and let you guys know what the parameters are.
If anyone has any advice or questions about the discus i would be more than happy to hear/ answer them.
Here are some pictures of the affected fish.
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