Why are my clownfish babies dying?

[Lou Young]

I have been breeding clownfish for fun for a few years now and never had this issue so I figured I would ask for some help. Starting at around day 30 the clownfish babies are dying slowly overnight. They are raised in a 10 gallon tank and I use a seeded sponge filter. Daily 2-3g water changes. I'd there anything happening in the nitrification cycle around the 30 day mark that would tend to kill small clownfish? Any advice is appreciated.
Thanks in advance?

 

[kizanne]

Are you testing for nitrates? Do you have reason to suspect it's nitrates? Do you test ammonia? What are you feeding them?

 

[Reefman802]

I would say they are not eating

 

[1claire]

I would say they are not eating

Are you that this is the correct conclusion to the problem? :fish1:

 

[ThRoewer]

Feeding too much brine shrimp, especially unenriched, tends to do that.
I lost a lot of anemonefish and marine betta fry to that until I identified the Artemia as the trigger. After switching sooner to different foods the dying stopped. Under the right conditions, anemonefish will take small frozen copepods at about day 5 after hatching.