Can I raise crownfish fry with only a few sponge filters until 4 months old?

kang · May 30, 2023

Hi all,
I am attempting to raise some clownfish fry.
Over 100 fry are in a 20 gallon tank and are one month old from hatching.

Has anyone raised crownfish fry with only a few sponge filters until they are 4 months old from hatching?
I am worried whether the filtration capacity of the sponge filter in use will be sufficient in the future.

I want to move the fry to a sump tank which has more powerful filtration, but I don't have the space left to add another tank.
Since they will be sent to other places after 4 months of hatching, I hope that the filtration is sufficient until then.

A Young reefer · May 30, 2023

if you could maintain a good water quality and clean them frequently, I don't see why it cant be done.

kang · May 30, 2023

A Young reefer said:
if you could maintain a good water quality and clean them frequently, I don't see why it cant be done.

Ammonia has been 0,
because the current 1-month-old fry excrete a small amount.

However, 4-month-old fry will eat a lot and excrete a lot,
so I was worried about whether a more powerful filtration system than the current sponge filter was necessary
to prevent ammonia poisoning.

In general, is it possible to filter the excretion of more than 100 4-month-old fry
only with a sponge filter and water change?

I've never had so many saltwater fish in one tank.
So maybe I'm worrying for nothing.