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Ammonia2007-11-24 23:09:32

Please read the following links:

http://freshaquarium.about.com/cs/diseas...

http://www.fishlore.com/nitrogencycle.ht...

http://www.fishlore.com/cloudywater.htm...

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Definitely!

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Your tank is too over crowded and you didnt properly cycled the water. If you wanted those fish you needed a 500gallon tank to start off with then continue to upgrade because of the kois.

First of all kois need 120gallons when young then upgrade to a 500-600 gallon tank then to a 1000gallon tank or a pond. And are you sure the swordtail kois are actually kois because theres Swordtail fish that is a koi color breed "Koi Swordtail" which only gets up to 3inches long.

The rams could have fought the koi or each other since they both could have been males and each male needs 20gallons and a pair(male and female) needs 25-30gallons.

The suckermouth catfish is called a plecostomus, or pleco or armored catfish, etc which get up to 2feet long.

The tank needs to be cycled by two fish at first, then after 1week and a water change add 2-4fishes then so on. And to tell if the tank is proprerly cycled there should be some algae growth.

And the tank needs a 50% water change weekly or not the other fish will start to die of from the ammonia.

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First, there is no such thing as a "swordtail koi." And, you'd better not have any real koi in there anyway. They grow to 3 feet in length and you would need at least a 200 gallon tank for one koi alone. Stay away from koi. They're outdoor pond fish. I'm hoping you meant swordtail tropical fish. Anyway, for your boyfriend saying he knows what he's doing, it sure doesn't sound like he knew what he was doing. He didn't let the tank cycle. It takes 4-6 weeks for a tank to cycle, and he should've been testing the water BEFORE adding the fish. Not after you added them and they started getting sick. Either you are going to need to take the fish back before anymore die, or you are going to have to let them tough it out while the tank cycles. Chance are, more, if not all, will die. You need to read about the nitrogen cycle and get that tank cycled. For right now, you need to do a 50% water change immediately and test the water 1-2 times daily and do daily 20% water changes to keep the ammonia down.

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Your bf made a big mistake.