02-27-2010, 01:10 PM
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The first thing that kicked my eye was the way to many discus for that aquarium. Discus are fish that should be kept by themselfs OR with neon tetra, never with barbs and other "pepsi" like fish. Also they need a pretty high water temperature,around 29-30 celsius(84-86 fahrenheit). They also require pristine water, nothing below perfect.
Why feed your fish meat and bread????? You NEVER feed a fish your leftovers, no bread, no meat, nothing liek that. All petshops sell special fish food. If you can afford discus you can for sure afford quality fish food.
Your fish are dying mostly because they are overcrowded and because your water is not what they need. After you put the water in the aquarium did you let it cycle for a week or 2(atleast)? It needs to so it can establish a bacteria bed in your biological filter, bacteria that helps keep your ammonia, nitrite and nitrate levels down.
Also oscars need way more space to live, you can't keep 5 of them in 200L, to be honest you can't even keep 2 in that space, not to mention all the other fish that are there.
Take all your fish back to the store, let your water do it's thing for 2-4 weeks and only then you can put some fish in there. In any case not discus(they are not fish for beginers), not oscars(they are not fish to be kept in 200L).
The barbs are ok fish and from my personal exp. with them they are easy fish to keep.
Also you did not mention what filters you use, at 200L you need a water filter that can pump 800 liters/hour to make sure your water is clean.
If you don't take action now you will have way more dead fish than you would hope for.
Also if you don't have plants to supply oxigen you might want to consider an air pump, they are pretty cheap and they last long.
You can also help the cycling by adding special bacteria, they are also sold by petshops, ask for Sera Ammovec or something similar, it doesn't do wonders but it helps a lot. Some don't agree with it but for me it worked as intended.
Put some in the filter and some in the water. You need around 40ml of it for every 100L of water.
That's about it from me, maybe someone else can shed some more light on your problem.
Good luck with the fish, hope not to many will die.
Last edited by Redknee; 02-27-2010 at 01:17 PM..