Are Berghia nudibranchs reef safe?

Yes. They eat Aiptasia, the whole Aiptasia and nothing but Aiptasia. As a consequence of this, once the Aiptasia is gone, they will go hungry. Normally nocternal, they will start roaming the tank looking for food. You will have 4-5 days to catch as many as you can and move them on to fellow reefers or to your local fish shop. 

When will these be delivered?

I like to get them out as soon as I can, so if you are at home to receive the package before 1 pm the day following your order, there is a good chance you will get them then. If you live close and the weather permits, I might even cycle over with them the same day. The shortest time between order and delivery so far has been about 4 hours.

I only have very few Aiptasia, can I just get one?

While I am happy to send you just one, you should be aware, that just one is very unlikely to solve your Aiptasia problem. They are small animals, don’t eat very much individually. Their power is in numbers. You want them to lay eggs in your tank, so the hordes of the next generations can eradicate your Aiptasia. For them to lay eggs, you need at least two, it’s good risk management practice to get at least three.

Can you send me the biggest ones you have?

Yes I can, in fact, I always aim to. Living in constant fear of running out of Aiptasia to feed the nudis, I want to get rid of the biggest ones that eat the most first.

I have rollers/filter sock/filter floss between the tank and the sump, could this cause a problem?

Potentially it could. The nudibranchs have been known to get stuck in these, although this isn’t always the case. It is best to remove the obstruction if at all possible without compromizing the health of the tank.

I have Aiptasia in both the display tank and the sump. Where should I release the nudibranchs?

I would put them in the display tank. The nudis have a way of travelling between the tank and the sump, so they should get around to removing the Aiptasia from the sump too. The display tank will have expensive corals endangered by Aiptasia, it is much more urgent to clean them out there, than in the sump.