I ran out of RO filtered water and couldn't get to the LFS for a few days, so I topped off a few times with bottled "filtered spring water". The jug doesn't indicate if it's RO filtered or not, but a day or so after using the spring water I noticed a few of my fish hiding and acting very sluggish. My tank is 36 gallons and I would say I've used about a gallon or so of the spring water. Did I screw up?