Hi everybody,
I have been busy, and I can read that a lot has been happening I wish I lived close to you guys and meet each one of you ..sigh..

Another question for the gurus here : I found yesterday that the fish was piled up at the corner of the tank. Then I realized that the heater of my discus tank was unplugged since the last water change. So, there was no heater for more than 24 hours and the temp was around 74-76 F !!!. I took some of the water out and put two heathers in the tank and in 4-5 hours the temp recovered to the usual 86 F..Then I filled up the tank with new water added some salt.

They semed really scared for 24 hours, now they seem ok and they rush for the food. Only blue D has 2-3 gray dots on his skin/fins. I am not sure if it is something serious.

DO you think I need to do some other stuff to prevent any future problems??
What would be the cause of those drak spots?

Also do you use iodized salt for the fish at all?

Thank you very much for the help as usual!
Regards,
Fethi