I was really tired when I wrote that. Of course, now I realize that substrate matters. I have to apologize AGAIN for a rude reply when people were just trying to help. It's not an excuse but my sleep problems are really getting to me and on top of that, a new RX is making me even more irritable. I won't even mention my family...! I need to put a disclaimer before I type anything... Again, it's not an excuse but still.
It's pool filter sand and some green and yellow gravel with some white rocks that I found at a thrift store. Maybe not the best choice... I tested my water again last night after doing almost a 100% water change the previous night (I know I should have done another water change last night but read on for my reason), pH has gone down but is still higher than it should be at 7.4. I was wrong about my well water's pH, my brand spanking new test kits reads it at an even more acidic, I'm guessing 6.2 because the color is in between 6.0 and 6.4. My old kit results were off, which is why I thought it was 6.8. I wish it was 6.8...
I'm going to buy new substrate for all my tanks this week so if it's the substrate causing the pH weirdness then that problem will be remedied soon. I'm only using the thrift store mix in one of my other tanks and it's my snail tank with really high pH and my GH kit wasn't reading results so I had to send it back and I'm waiting for the replacement.
I tested the ammonia again and it went down and is at .25 ppm. I do admit to over feeding once in a while (Jewish mother syndrome) but I've gotten really good about it. I take out how much I WANT to feed, then I cut that into 1/4 and feed the 1/4! I do also use some home made fish foods but they don't seem to be causing more pollution than any commercial feeds that I've purchased in the past. I haven't been using frozen foods or live recently.
There are no more dead or sick looking fish. The one that I thought I was going to lose recovered. Everybody's color looks good, including no inflamed gill slits.
I didn't add more Prime because I did that when I did the water change (although you do need to use it every day for water problems, right?) but I did switch out some of the filter media with that from a different tank. If you saw the scrubbie that was in the problem 10 gallon, it looked like your normal, bacteria laden scrubbie with gunk and all. I'm going to test the water today, then do a water change and then test the water tomorrow to see if the filter media switch helped the problem. Then I may put the plants back in and test the water a few times.
So after learning that apparently, having the media drying out will kill the bacteria colonies, this whole thing makes sense. Bio-load from the fish + bio-load from uneaten food + extra nutrients from fertilizers - filter's ability to process it = death. Maybe it was the Osmocote building up that clinched it. I think some got exposed to the water column because of the froth on top of the tank.
Um, lesson learned. I'm not exactly dealing with a full deck of cards here. I should have known this and probably knew this about the bacteria at one point but forgot it like so many other things. My other filters are either submersed or had water left in the bottom while this particular filter either drained completely or only had such a small amount of water that it dried up shortly. So the next time there are any prolonged power outages, and there will be, I'll take my filter media out and stick them in sandwich bags or something.
are the pots of your potted plants shoved into your tank substrate? if so, you'd benefit by very large water changes when you remove them, move them or alter them in any way.
I don't know if it counts since the tank's substrate isn't even an inch deep. The pot is a 4" plastic pot with Shult's Aqua Soil filled to the brim. It wasn't stirred up when I placed the Osmocote. I easily just inserted it towards the middle depth of the pot.
when you saw dead anything in your tank, did you do massive water changes just in case?
Yes, I always do. Although, not always at once if there's old tank syndrome.
are your plants flourishing, growing, healthy, green, alive and beautiful or do they seem to be holding their ground barely or losing ground?
Yes, they're doing quite well, even w/o CO2 or supplemental lighting. They're even staying potted with no problems with no weights.
what is in your tank that makes your ph rise to 8.0 in your tank from 6.8 in your tap? are you letting your tap water off gas before testing the ph?
I have no idea!!! If I knew then I wouldn't have been so puzzled and concerned about it when I posted about it. I'm not having that problem in any of my other tanks. And the pH in my other tanks, except this one and my snail tank are reading the same as my tap water, 6.2ish. Yes, I let the tap water sit a while before testing it.
did you even consider testing your tap water for ammonia too?
Yes. There's none. I also tested for chlorine and all kinds of other things. I have really pure well water. Clean as a whistle.