Water change killed my snails - when to stop?
Hey all! Thanks for the help thus far as I set my tank up and get established - it's been great to draw on everyone's experience! I have a few questions about water changes / parameters, but first ill let you know a little about the tank:
So I've got a heavily planted 5 gallon soil substrate tank that is about 1.5 months old. The plants are doing great and I introduced bladder snails and MTS early and they are doing well - lots of babies which is what I wanted.
I have been doing weekly water changed to get rid of excess tannins (and because it's just sort of become a habit...) The way I do it is to slowly add water with a pump and take out a cup at a time until I've added about ~3 gallons of fresh water into the tank. So this is about a 60% water change or more.
Today before the water change I checked the parameters and it looks like it fully cycled (0ppm NH4, NO3, and NO2). My GH is at 130ppm and KH at 120ppm.
AFTER the water change some of the bladder snails started to freak out, expelled tons of frothy mucous, and several died. I didn't think a water change would effect them like this but it clearly did.
I added a few picture of my GH, KH, and PH progression throughout the tank getting established and one of my tank (because I'm proud of it...)
My questions are:
1. Why did this kill some snails?
2. Was it necessary to change the water at all?
3. When I do change the water is 60% too much?
4. Is my GH and KH at a reasonable level? (I eventually want to add some fresh water shrimp)
it doesn't seem
very anxious to bloom,
this plum-tree at the gate (Issa)