Why are my clownfish shuddering?

[segunton]

I have had two ocellaris clownfish for about a month and a half now, and the other day I noticed the larger one (Ginger) shudder near my smaller one (Fred). Now today I saw Ginger shudder again, and then Fred 'shuddered back'. Plus Ginger is becoming more aggressive... haha when I go to clean the tank out she'll come and bite my hand.
I was wondering if this was normal behavior, or what does it mean?
Thanks!

[Gangstafish]

They are mating. The larger of the two is female the smaller one is the male.

[skippy2]

It's not necessarily a 'mating dance'. Ginger is just letting Fred know who is boss. Ginger is showing dominance and Fred is showing submission.

[BToast]

Yup, I agree, this is very common.

[mcsassy]

Ya mine always used to snuggle against each other until I got an anemone...then the female got too aggressive towards the male and I returned the anemone but the male's colors darkened since and he has been some what submissive towards her since. Her aggression has died down a lot though since I took the anemone away.

[Gangstafish]

Mine did the shimmy,then laid eggs.

[-Nemo-]

Mine did the shimmy,then laid eggs.

are there any reports of these fish doing the hokey pokey? ;)

[skippy2]

Mine did the shimmy,then laid eggs.

Mine did the shimmy for 5 yrs. before they laid eggs.
Right after their first clutch my female died.