high nitrates, dead tetras?? (longish)

Traci

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Jun 27, 2003
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A couple of weeks ago I used the wonderful advice of Tempest and Oriongirl on identifying what I had and what I could add. I siphoned out what we decided was a 15 to 20 gallon tank, used AmQuel to detoxify the replacement water before putting it in. Then I went out and got 4 Lemon and 4 Serpae Tetras to be tank mates with the Gold Gourami, Spotted Raphael, and Chinese Algae eater. This was 2 weeks ago last Friday. Everything was great. No floaters the following Monday, happy swimmers all.

4th of July I came in, all was good. Still had my newbies, and the older set. Then, last Monday one Lemon Tetra was gone and no remains remained. Clearly it died and became part of the food chain. Last Friday I set everything up to clean the tank (see Oriongirl? I'm trying to stick to your recommended schedule!) I vaccumed out about 2.5 gallons and added the same back in after using the AmQuel and acclimating the new water temp to the old.

AND...

One of the Lemon tetras quietly drifted to the bottom and keeled over. About 20 minutes after adding the water, a second Lemon Tetra begin swimming frantically and rather horizontally, drifted onto a plant and died. Whoa! Wasn't expecting THAT! So, I waited for about 30 minutes to make sure I lost no others. Then I took a water sample over to Petsmart. The nice lady there tested, said the ammonia was a bit high, that the nitrAtes were HIGH (bright purple on the strip and reached it within 10 seconds), but everything else was great. They recommended another water change with AmQuel PLUS and bring test again before restocking. Also suggested live plants as opposed to the plastic ones.

I did that (this time siphoned maybe 50% of the total volume) and replaced after treating with the Amquel +, and also took out the old plastic plants.

SO..this AM, the last Lemon Tetra is history. No body to be found. I snagged my dad's test kit from home and the nitrAtes measured between 20 and 30 ppm. I treated the tank with more AmQuel + and tested an hour later, down to 5 ppm. Tested 4 hours later and showing @ 0 ppm.

I'd originally intended to add live plants, but as the tank has gravel don't know if that would work. Also, just noted multiple feathery algae clumps growing on the faux rock castle that were not there on Friday.

Any idea what my tank is doing? Think it's safe to add some new fish (obviously not more Lemons, though the Serpaes all made it through), and should I add some plants and if so what. Currently emply except for several small rocks and the castle inhabited by the raphael.

Much thanks for any help/.
 
How long has the tank been running for? If there was an ammonia reading, your tank might have not cycled yet, or, there was a big difference between the water in your tank and the water from your sink. I would test the ph of the tank and the ph of the sink water and if they are very different, then that could be the reason.
 
The tank has been running for at least 2 years in the office, probably longer as it was a hand-me-down bbrought in when the boss' kids got bored with it. Time restraints and general disinterest caused it to get only minimal attention for that time.

There is a post by me a few down with further details. Before the "great revival" I never tested the water, so the ph suggestion is probably a pretty good one!
 
Come to think of it, if I read it right, you added 8 fish in one day to a 15-20 gallon tank. That is way too many at one time. You have to add them slowly so you give your bioload a chance to get bigger to support the fish load. So, the reason you had ammonia was because your tank was going through a mini cycle.
 
Originally posted by Traci
I'd originally intended to add live plants, but as the tank has gravel don't know if that would work. Also, just noted multiple feathery algae clumps growing on the faux rock castle that were not there on Friday.

There are several plants that you don't actually have to plant in the sustrate that would work to eat up some nitrates - anubias, java fern, java moss (they attach to ornaments instead) and anything floating, like water sprite or duckweed. The algae could be because of the high nitrates, or excess of other nutrients. Make sure you are not overfeeding.
 
Originally posted by aquariumfishguy
Why were you only taking 2.5 gallons out at every w/c? Thats not very much considering the size of the tank...

-Cory

Well, I wasn't quite sure how much to take out. OrionGirl said that a complete water change wasn't necessary and to siphon into a bucket, and the bucket I got was 2.5 gallons. When I did that, the water level was about 11 inches, almost to the top of the little castle, so I thought that seemed sufficient. Should I be removing more than that? I'm not sure of the tank volume. 15 to 20 gallons was an estimate based on the tank dimensions from my previous post.
 
Originally posted by NJ Devils Fan
Come to think of it, if I read it right, you added 8 fish in one day to a 15-20 gallon tank. That is way too many at one time. You have to add them slowly so you give your bioload a chance to get bigger to support the fish load. So, the reason you had ammonia was because your tank was going through a mini cycle.

Yes. 4 Lemons and 4 Serpae. I added that many based on the suggestion of the guy at the aquarium store. In fact, he said that I had the room for another small school of tetras if I wanted.

So, then why did it take 2 weeks before affecting the Lemons and how did the water change figure into it? Obviously it had to, since at least 2 died immediately afterwards.

And, how many should I add now? Or rather, how many can I safely add now?
 
I don't know, thats the thing. Maybe is was just a coincidence, or there was obviously something in the new water. Don't add anything for awhile, wait a few weeks for everything to get stable. Also, buy test kits for your tank so you will know when there is a problem: ph, ammonia, nitrite, nitrate, gh&kh test kits.
 
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