The only time I had triops was a while ago and it was a little kit with no filter and never called for water changes, so ti si pretty obviouse why they did not live long!
What temp water do they like?
How big to they get if allowed enough room to grow?
How many could you have per gallon?
Do they need a heater?
Oh wow black cat! I thought maybe because of the kits, with no filter and the tank cycling with them in it might cause an early death, I never knew they lives such a short life. Interesting info!