Chromis & Blennies

[Madreefer]

Originally Posted by michika

Chromii/Chromis kill each other off eventually. And they don't school unless something elicits the schooling behavior - usually a larger fish or something to trigger schooling behavior. Don't get me wrong, they're great fish, but they seem to die off when in groups until only one or two are left standing.

I have read the same thing. 6 months ago I put 9 chromis in my tanks and they schooled right away. There is no fish in my tank that pesters them. All 9 are still alive and make a cool looking school. I'm sure as time goes by they will start picking each other off.

As for the spare 20G i'd leave it as a quarantine. Having 2 tanks is a pain. And your plan of transfering fish from that tank to a sump when needed is too stressful for the fish.

[tang daddy]

The only fish I had that schooled were blue eyed cardinals, they always stuck together. Anthias and chromis will always kill the weakest link, I had 5 chromis and now one remains.

It would be a bad move to get a bunch of chromis in a 20g IMHO....

If you want something cool to look at for the 20g why not get a frog fish or dwarf scorpion?

[monocus]

way too small for chromis.start your tank with raw prawn,or if you must have fish,an adapted mollie or a clownfish

[asylumdown]

My experience with green chromises (chromi?) was that if you are lucky enough to get a good sex ratio, you won't have as many problems. I started with 5 juveniles, 2 turned out to be male. The two males fought constantly, but things were relatively ok between the females. If I had gotten more males, I'm sure there would have been deaths.

I do agree that 20 gallons is a little small for more than 1. They get quite a bit bigger than you ever see them in stores, and if you got two, and both turned out to be male, it could be ugly.