A year or more ago I got tired of all the work involved with high tech tanks and ditched the CO2, Canisters Filters, and ferts for something a little simpler.
A few water changes through the year and some squirts of metricide here and there.
This is what I wound up with... an absolute jungle of vals, bolbitus, dwarf sag, and assorted ferns.
Well, I got bored with this recently and bought myself a new regulator, switched out my old 5lb tank for a 10 pounder, sold all the ferns and vals, bought some new stems, and connected a diffuser under my powerhead. I have a bubble counter but haven't installed it yet. I was just guestimating the amount of gas going into the water by comparing the mist to memories of old setups in similar sized tanks.
I also bought and started using a drop checker which apparently works very well, unfortunately I didn't pay any attention to it.
2 days ago the DC was blue
Yesterday it was Green but I accidentally tipped it over and thought perhaps it got diluted with tank water.
This morning it was Yellow
hundreds of dead shrimp were floating at the surface
6 L-15 Plecos were upside down on the bottom
A pair of BN Plecos were upside down on the bottom
Dozens of Tiger Endlers and a few large Apisto Cacs were swimming around like nothing had happened.
Solenoid Off, turned up the air on my sponge filters, added a bait bucket bubbler, and crossed my fingers. Unfortunately I had too much going on to be able to do a water change. I turned over all the plecos, placing them right side up and wished them well.
Now, 12 hours later... 1 L-15 is fertilizing the grass, and lots of shrimp are in the trash but I think everything else might make it (at least a few more hours anyway).
I guess the cats were hardest hit because they naturally prefer highly oxygenated water. Shrimp, because they a shrimp, were hit hard as well.
I was surprised to find the mid level swimmers were all ok.
Drop checkers are wonderful things, I just need to pay attention to what it's telling me.
I need to connect my Bubble Counter.
I should probably add a few tablespoons of Baking Powder and some GH Builder to the water.