Water change = tank crash?
I had a bit of a tank crash this weekend. Not really sure what happened. I changed about 30% of the water and all was fine. The next morning I woke up and half my fish were dead or dying. The others were gasping at the top, which I've never seen them do.
I immediately pulled out the dead fish, turned off my CO2 and added an air stone to the bottom of the tank. I then tested all levels of amonia, nitrates, etc and all was good. What happened? How did a water change cause a crash?
When I do water changes I pump about 25 gallons of water into a tub. The tub has a maxijet 1200 PH in it. I then add some stress coat or tap water conditioner and some plant ferts, mainly seachem trace elements. I let it mix for a while and then I do the water change.
Recently I've added a UV filter to get rid of the green water issue, which has worked great, but I have no idea what happened here. I've readded carbon to my fluval 404 to get rid of a potential polutant.
I also added 10 neon tetras to the tank on Saturday, and added a few shrimp pellets for my crayfish.
In the meantime I've lowered my CO2 input and put the co2 on a timer to shut off at night. I've also added an airstone which kicks on when the co2 is off. I'm a bit worried to do another water change but feel that it might be the necessary if their is a pollutant in the water.
Any ideas on what happened here? If water changes are this stressful on fish, (I normally do 35%/week) will the plants survive if I only do 30%/month?
Thanks in advance,
75 Gallon - 4x65w PC, HP CO2, Eheim 2217 feeding Aquamedic 1000 CO2 Reactor, Fluval 404, 18w UV filter (for emergencies), Peat Moss, Flourite, Eco-Complete and Onyx Substrate
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72 Gallon Bow Front Reef with 20 Gallon Sump, MH + PC Hood, Wet/Dry, Calcium Reactor, 11w UV filter (for emergencies)