i am not sure the fish take strips will work never tried it.. but you can purchase soil testers for pretty cheap... there are also the ones that have the metal prongs at the end with a variety of things, PH soil, moisture, light etc. they run about $30 i think

maybe try flushing a little more thorough meaning with more water, then let dry out for like a week, i am no expert though, just something i would try if i had nothing to lose, cuz if you change the soil you still have all the soil that is tied into the roots that your not changing.
HapaPride Reviewed by HapaPride on . First day of 12/12 and WTF happened? I set my mother plant to 12/12 light last night and when I got up this morning she was all but falling over. I'm afraid I used the water that I have for hydro which has vinegar in it to bring down the PH levels. Not much, but apparently enough to come close to killing a plant grown in dirt. I'm going to put the light back on 24/0 for now, any other suggestions? I'd really hate to lose her, she's the closest thing I have to a bud right now. Rating: 5