Gasping fish and shrimp deaths, help! COVID-19
I hope this is the right place to ask for advice.
I have a planted 40L tank, with CO2 and a Aquael Multikani. A rubbish LED light, which is far too powerful. I am diligent in maintenance and testing, with no problems for at least a year.
I have a mix of livestock, 6 ember tetras, 1 glass catfish, 1 pygmy cordy, 1 loach, 1 cardinal, 1 green fire tetra, syndontis polli - a real mix from a rang of tanks and aged between 3 - 5 years of age. I have a number of tiger shrimp (though all my pregnant females have now passed away) and a number of a ghost shrimp (mainly darwin algae eater, with my oldest having past away over the last two days).
With COVID-19 my tank has had far too much attention from me. 2 days ago I decided (stupidly) to pullout a number of old stem plants. I did a 50% water change, and went to bed. The following morning everyone was gasping at the top of the tank and most of my shrimp were at the waterline.
I did a 50% water change, 1 hour later no change. Did another 30%, with no change.
I added a charcoal to my spare filter.
This morning, still gasping.
Ammonia - 0ppm
Nitrite - 0ppm
pH - 6.0
Any advice, I have some elderly fish who I really don't want to lose and my poor shrimp are struggling.
Adore my planted tanks and their denizens.