What would you say would be the most sensitive species of fish who would show the first signs of distress in a tank? I test my tanks often and do water changes twice a week, I'm not intending to willfully neglect my fish, but if someone wanted an aquarium canary, what would it be?
APierce Well Known Member Member
I know of a saltwater "canary" but I'm unsure of any freshwater ones :)
david1978 Fishlore VIP Member
Mcasella Fishlore VIP Member
Snails, they either try to escape or close up, mystery or nerite best here (trapdoor if you want but all I did was manage to kill them).
Nataku Well Known Member Member
These peaceful schoolers are often used by angel and discus keepers as dithers and canaries. They have bright red noses when water quality is good. Their colors fade out fast and become very pale, the red like a faded washed out barely there pink when the paramters are bad.
TheCrayfishGuy Member Member
otos. they will die of starvation in afew days.
JLeeM Well Known Member Member
I second shrimp or snails. They are very sensitive to high nitrates.