Hippo's are notorious for ich. If you look at them wrong they seem to get it. Unless you quarantined her for it then even though it looks like it was gone it was not. Ich runs in cycles and while it may go away for awhile the cycle continues. And some it seems to just go away and then a stressor comes along and they get it again. Do you have other fish in the tank? If so then be aware that the cycle will now continue...Just an FYI....As much as i love hippos it is one that i will never get again after it wiped out my whole tank years ago.
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