Survival in unfiltered tank

[Lupin]

but what should a good schedule for water changes be?

It will depend on how much your ammonia, nitrite and nitrate pull throughout the process.

 

[LiveCulture]

the free filter sounds very good to me but the goldfish are so cute and i dont want them to be harmed

 

[Lupin]

I think you have a pearlscale and a comet from your other thread. Comets are too big. Your 15g will fit only one pearlscale.

 

[LiveCulture]

that sounds accurate

 

[LiveCulture]

i once kept a baby silver arowana in an unfiltered tank for 3 weeks, feeding it blackworms and krill generously and i had to give it away because it grew too large....very healthy fish throught the process

 

[cichlaguapote]

i once kept a baby silver arowana in an unfiltered tank for 3 weeks, feeding it blackworms and krill generously and i had to give it away because it grew too large....very healthy fish throught the process

Keeping any fish in an unfiltered tank is a slippery slope.. Very easy for things to go wrong and I wouldn't suggest it ever as a reasonable way to keep fish.

 

[LiveCulture]

youre right its wasnt the smartest thing to do but i went with my instincts and kept a very close eye and the fish prevailed

 

[Nyquil Junkie]

Why dont you stick cheap $20 HoB filter with a bio pad in it on the tank....
It'll keep them alive and reasonably healthy after the bio pad grows a bit.

With just an airstone, I'll give them about 2 weeks before the ammonia kills them. Maybe less.