is that y ang big oranda eat less?

[Temo]

i used to have 4 big oranda with 4 small oranda in 20 gall and they've been doing fine for 3 year.
sundenly something is wrong with my water and 2 of the big one die!
then 3 week ago 1 big and 1 small oranda die
and now i only got one big and 3 small oranda
and the big oranda doesnt eat as much as when it with the other big oranda
(my 4 big oranda has been to gether for 5 year now)
is it because it missed it friends ?:confused:
1st pic:when they are small(the smaller one die cause it eat too much
and one of the orange one die so i replace it with a black one
2nd pic: the beginning of the year
the black, one in the top corner ,and the light orange die

[Lupin]

What are your water parameters?

[mostlycichlids]

I would have to lean towards your water parameters. Goldfish release a lot of hormones in to the water as well as waste. I don't know if you know but the 20g is too small for more than one oranda. I see you have what looks like a 30g whisper filter or something similar. For the fish you have in there the filtration is inadaquate. I would lean towards tripling that. The tank is also bare bottom which has pros and cons. The pros are you can keep all the excess food and waste out. The con is no other place for good bacteria to grow, besides the filter.

Here is an article to give you a better idea of goldfish care...hope it helps.

http://www.aquariacentral.com/forums/showthread.php?t=97350

[GoldLenny]

You are severely overstocked. A 20G might be OK for 1-2 juvenile goldfish for the first year but after that, they need MUCH more space and water volume or they will suffer from stunting issues which translate into immunity system issues and health issues.

While it worked in the beginning, your goldfish grow by eight times in body mass for each time they double their length so when they grew from 1" to 2", you would have had to increase the water change schedule, filter maintenance and feeding by eight times. Then as they grow to 4", you would have had to increase everything by another eight times. This means that if you were doing weekly PWC's (partial water changes) and filter maintenance in the beginning, you would have increased it to daily and then to eight times a day in order to keep up with the hormones and waste levels created by the fish.

[stephalpha]

A 20 gallon tank is only big enough for one goldfish. For your original stock you would have needed at the very least a 55 gallon tank, but bigger would have been better. Your water parameters were most likely the cause of your loss in stock. The fact that you were severely overstocked and did not have proper filtration for that amount of goldfish played a huge factor.

[legendaryfrog]

A 20 gallon tank is only big enough for one goldfish. For your original stock you would have needed at the very least a 55 gallon tank, but bigger would have been better. Your water parameters were most likely the cause of your loss in stock. The fact that you were severely overstocked and did not have proper filtration for that amount of goldfish played a huge factor.

yep, i definitely agree. Goldfish are massive waste and hormone producers. Its most likely that the rise in ammonia, nitrite, or ammonia killed your goldies.

[Corvina]

I agree with stephalpha.
Maybe you can try to get a larger tank for your goldfish?
Sorry about your loss.