maturity. So if your fish became infected at the wholesalers (sometimes with their central flow through systems) and you picked up the fish at a shop a couple of weeks later, 2.5 to three months before you discover the damage is not unusual. I think you suggested that large guppies not delivering fry, in addition to your more recent behavioral observations, are important warning signs.
However by the time the adult Ca,ellanus are releasing young, the guppies or whatever is hosting them, could be in pretty bad shape. That is the problem with hidden biological time bombs we may not even know exist.
I've a couple of 2.5 gallon tanks which don't get used as much any more, except as holding tanks for new purchases. So long as they are there anyway, adding a dewormer and then maybe the next week changing out the water 100% and adding a parasite guard for internal stuff is not a bad idea.
My purchases these days are mostly from club auctions. They are not as inclined towards illnesses as stuff which has gone through commercial channels and been exposed to more fish and more stress. Velvet spores and bacteria could still come in through the water supply or be airborn, so it still makes sense to keep the tank as clean as possible.
My one case of Ich in decades came in with some Endler's via a club transaction (Christmas party actually - Ho Ho Ho) and must have been quiescent for 3-4 years before having the opportunity to break out of their cysts to make themselves known. Got greedy at the ALA convention and placed several fish together in a ten gallon tank and Hexamida took some of them. The two tanks of Goodieds which were set up by themselves were fine.
When, oh when, will "my eyes not be bigger than my stomach?"
All the best!
unc;e
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