Crash.

[lpsreefer]

What kind of silicone did you use to build your sump?

[slats35]

Tremco. Pro glaze. Has no mold inhibitors. 100% silicone

[slats35]

Can a person over dose with herbtana. I may have done that. Fish are swimming around again. 15 gallon water change so far. ( I have a 120gallon). I might of caught this early enough that maybe only 1 loss so far. I hope. The original fish that looked sick. I dosed herbtana and the rest of the fish were not looking good. Now with the water change. They are swimming around again. I hope that I caught it fast enough.

[lpsreefer]

Glad to hear. Maybe do another water change in the morning.

[jtbadco]

In the future I would try to avoid panic reactions like that.

IMO you only treat for what you know to be happening, not what you suspect. Treating a tank with anything without proof that there is need is dangerous....as you found out.

If one fish has already died I would do a much larger water change.....like 30-50%

Quote from the Tremco data sheet...

'PROglaze is not recommended........in continuous submerged applications'

Not sure why?
HTH

[Ginu]

I would stop using that sump ASAP... I do recall that silicone is meant for windows and not aquarium use...

[howdy20012002]

Ginu
pure silicon is fine and is what is required to build fishtanks.
why most silicones are dangerous is because they have anit-mold additives which will kill your tank.