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Old 05-26-2018, 10:47 AM   #11
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I didn't take any bio media out, but I added about 8-10x more than I had before. I had 2 hob filters; I kept one intact (except for adding carbon later on) and it's still running, and took the bio media of the other one and the bio media of a box filter and placed it all in the new canister (with the new bio media).
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Old 05-26-2018, 11:13 AM   #12
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Update: I lost one gold tetra yesterday, but I'm leaning toward thinking that it was just old. I lost a first gold tetra about 2 months ago (at that time only second fish I had lost in 18 months), and I got them 2 years ago.

So, having more time on this Saturday morning, did a bunch of tests:

Aquarium water: Ammonia 0, Nitrite 0, Nitrate 30, PH 7.2, Phosphate 0.25
Tap water: Ammonia 0, Nitrite 0, Nitrate 0, PH 7.2

Nitrate is surprisingly high in the aquarium, since I usually get to that level only if I'm at least 2 weeks without water change (it's been 3 days since a 50% water change). Still it's an acceptable level, but I believe it shows there was some bacterial activities and cycling going on (maybe I still had 0 ammonia and nitrite because of Purigen?)

For ammonia, since I had a 0 reading a few days ago but I was expecting some trace in tap water because of chloramine, I tested both aquarium and tap at the very same time to compare colors. They were both identical, very much yellow (API test). I could not tell them apart.

I also tested nitrate in tap twice, since I was surprised to have a reading at 0. But there's really no doubt (again very yellow).

I will now do a small water change, and hopefully everything will be fine going forward.

I'm coming to the conclusion that I had too much water circulation and some species (lemon and ember) could not survive. In fact, looking at how my fish behave now, I'm thinking that I've always had too much water circulation, it just wasn't at a deadly level before. For example, my neons and my glowlights are swimming a lot more at different levels instead of remaining in the bottom third. The danios were always midway in the middle and the top, and are now a lot more at the top.

I was probably a bit too obsess by oxygen in my water, as shown by some of my posts. So hopefully, I will have learned a lesson out of all that happened and I will be able to provide for a better environment for my fish in the future.

Thank you to everyone who answered my posts.

I always welcome comments and suggestions, but I'm also providing this update for the benefit of anyone reviewing this thread and faced with a similar problem.
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