Thanks to everyone for the info and I will continue to investigate.

1) not all forms of nitrogen are toxic to corydoras, every time they go up for air they take in nitrogen.

2) the areas where they have collected wild corydoras aneus are stream like in fashion, if you never seen the difference streams are typically slower moving, their are areas where nutrients do ...

Also plants need soluable K it can't take direct K+ it needs potash K2O

Some helpful info would be that I already have been dosing K2SO4 which has higher levels of potash than KNO3.

Also don't really like doing large water changes I have done 1 in 4 years. Also should rule out other things like even the ratio of males to females. I have 1 male and 5 females, male is the youngest I've had him for 3 months ish, I worked at the pet supply store where I got him so I know he was ...

And while I belive most of what you are saying is accurate I hadn't done a water change in over 2 weeks, with a consistant feeding schedule that didn't change. The only thing that change was the amount of nitrogen in the water. Perhaps a coincidence but my brain figures that where corydoras aneus is ...

When i came home from college i was surprised to see one of my bronze corydoras depositing eggs onto a sword plant. it came as a surprise because i had over the course of about 2 months to get them to spawn with water changes and what not. I am writing this to put out what caused them to spawn ...