I just noticed this in my bleeding heart tetras this morning. It has two white bulb like growths on the ends of both its front fins. I have looked and have narrowed it down to three possibilities. Ick, fin rot, or columnaris. He acts ok and eats and swims fin. My nitrites are 0 and nitrates are around 10-20. Do I need to quarantine him so it doesn't spread to the other fish?