Hypo Experts - Quick Question

[nuxx]

Hey guys,

I lowered the salinity of our display down to 1.0085 about two weeks ago.

2 days ago I noticed two little white spots on our Black Tang's head. Nobody else has anything, and no more dots have come up.

The Cleaner Wrasse seems to be pretty in demand though, the Tangs are requesting its service often.

I'm wondering given the life cycle of ich, would it be possible for them to be in the visible stage after two weeks of hypo?

Using a refractometer and hydrometer to measure salinity. Also using an ATO. With around 700 gallons of water volume it's pretty hard for salinity to swing. I've noticed the snails I couldn't get are dead, as well as the one aiptasia I spotted is gone as is any red or green algae that had grown. So I'm thinking I'm def. in hypo.

BTW: Hadn't noticed any spots in over two months until two days ago. Never had a crazy outbreak, just 4-5 spots on a Yellow Bellied Blue Tang.

Thanks guys

 

[Deinonych]

There are reportedly some hypo-resistant strains of crypto, so it's possible you have one of them. The other possibility is that salinity rose long enough for a theront to infect a fish.

 

[nuxx]

There are reportedly some hypo-resistant strains of crypto, so it's possible you have one of them. The other possibility is that salinity rose long enough for a theront to infect a fish.

Otherwise it would have been too long to have shown up?

 

[Deinonych]

Remember that crypto doesn't have to be visible to be present.

 

[nuxx]

Remember that crypto doesn't have to be visible to be present.

Sure.

I'm just curious if in 14 days of hypo ich could get to the visible stage if not visible.

Not sure which stage it would be killed at.

 

[Deinonych]

Sure.

I'm just curious if in 14 days of hypo ich could get to the visible stage if not visible.

Not sure which stage it would be killed at.

The only stage affected by osmotic shock would be the theront (swimming) stage. So, if a tomont excysted during a brief period where the salinity rose above the critical level, in theory the theront could infect.

 

[nuxx]

The only stage affected by osmotic shock would be the theront (swimming) stage. So, if a tomont excysted during a brief period where the salinity rose above the critical level, in theory the theront could infect.

I don't think there is a chance that the salinity could have risen.

It would take 50-100 gallons of 1.026 water to even budge it past hypo.

i.e. Was messing with the returns a little yesterday and got pulled away, ended up dumping ~ 15-20 gallons of RODI back into the sump from the ATO and salinity went down around .00025 or so, pretty much didn't even budge.

The Black Tang still has the marks, but they are much much smaller... does that even sound like ich? Or maybe some sort of scrape?

If it was ich, is there a chance that it could have avoided being killed by hypo during the first 12 days and then get to the visible stage on the 12th day?