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Old 10-26-2016, 10:31 AM   #1
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New Tank- Time for 100% Water Change?

I am having a myriad of issues cycling / starting my new tank.

Here's a short summary.

125 gallon freshwater.
2 Aqcua Clear 400 GPH power filters
Undergravel filter
Moon sand
Originally had live plants. Have moved to just all artificial now.
Running for 6 weeks now

Ran for a few weeks fishless after setting up. After a few weeks added 2 common goldfish to help cycle. Both did fine for a week. Tank then underwent a bacteria bloom, got super cloudy and both died. Levels all spiked and remained high for a few weeks, never coming down, so decided to add API quick start. Levels all dropped to normal within days.

After tank had been set up for 4 weeks I continued treating with API quick start to keep levels normal, and added 3 silver dollars. Both developed red gills and fin rot and died within 2 days. Thinking tank still might not be cycled I waited another week and then added 10 Zebra Danio's since they are hardier. All died within 2 days after developing fin rot and red gills.

Let the tank sit another few weeks and tested water levels again. Everything was normal. This time added 2 goldfish again. Both did ok for a week, then seemed to develop white growth like bumps on them and redish gills; obviously both died.

So... at this point I am done killing fish. I clearly have a problem with my water and will not add anymore until this gets figured out.

My question for you is this: Is the likely cause of my problem that my tank is simply still not cycled after 6 weeks, or that I have a bacteria or fungal infection in my tank that needs to be treated?

Should I treat with medication for a week and then do a large (75-100%) water change since there are no fish or plants in it to worry about dying? Or do I just medicate and do small (10-20%) changes? Or do I not medicate and stop adding stuff to the water and just let it run for a few more weeks?

HELP!!
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Old 10-26-2016, 10:44 AM   #2
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If there are no fish in the tank, change out all the water. That will lower the amount of toxins or pathogens in the tank. I would do it even if there were fish in the tank, leaving only enough water to cover the fish.
If you have a sand substrate, you can't use an under gravel filter.
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Old 10-26-2016, 11:49 AM   #3
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125 gallon tank!

That is huge. This is what I would do;; start from scratch; put new water and let tank cycle on its own. Don't add fish or chemicals. I don't like chemicals. Check ammonia levels after 7 dayz or so; if ok add fish slowly.

Mike.
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Old 10-26-2016, 12:14 PM   #4
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Undergravel filter with sand?
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Old 10-26-2016, 12:23 PM   #5
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Ya I had one from a previous tank so decided to use it just for the heck of it, not realizing it would be worthless with sand. But I guess a question to ask, could it actually be doing me harm? I just figured it's probably doing nothing, but could it actually be hurting the water quality?
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Old 11-14-2016, 02:28 AM   #6
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are you using water conditioner?
is your tank going to be for cool water fish or tropical fish?
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