Hi everyone! I'm new here (have lurked for a while though) and I have a rather serious question.
My tank has been set up for almost a year.
Tank specs: (Low Tech)
Coralife Aqualight 130w
Medium to heavily planted
Fish: discus (1 - was a rescue... I'm working on getting him a buddy), rainbows (2), blue ram (1), tetras (9), cory cats (3), oto cats (3)
CO2 is Flourish Excel 2x a week
Because of the Discus I stay on top of my weekly water changes (about 45%). A few weeks ago I noticed that when I refilled the tank I got all of these little bubbles on the side of the tank, in the water, on the plants, and even on the fish! I watched them for a while and everything seemed well. Turned off the lights for the night. In the morning when I got home from work (I work nights) I found all of the fish at the surface gasping for air! I took water samples to test and immediately did a 50% water change. Did not get as many of the little bubbles and all the fish recovered quickly. The tests read as normal...
All was well until my water change on Sunday. Changed 45% again and noticed the little bubbles were forming again. Not as badly as the first time but still there. All the fish seemed fine at the time. Came back from work and turned on the lights and the fish all seemed distressed. No gasping at the surface but all breathing rapidly and looking uneasy. Took water samples again and did another water change. Fish recovered quickly again. Tests were normal.
This has never happened before these few times. I use Prime as a water conditioner and use a Python to refill. I changed the spraybar on the filter to point upwards to increase surface agitation thinking it might have something to do with oxygen depletion. All of the tests have stayed normal, no spikes. I can't figure out what's wrong!
I don't want to hurt my fish... they're my babies!
Thanks for any help you can give!