I'm new to "serious" fishkeeping-I've had tanks before but was not as careful as I should have been. I have spent the past few weeks fishless cycling a 75 gallon. I have added 6 otocinclus, 4 kuhli loaches (my LFS only had 4 on had but I will be adding a couple more eventually), and my angelfish. There are six total, all nickel sized. One gold, one marbled (I think that's what it's called) and four blue zebra. This afternoon when I came home, the marbled's top fin is laying back-looks windblown almost. He is easting and still swimming with the others. Should I be concerned? If it's something that can make them sick, I want to treat it quickly.
I just tested my water today. It's a planted tank but the plants are still young so not heavily yet.
pH 7.6
Ammonia 0ppm
Nitrites 0ppm
Nitrates 10ppm
Kh/GH max out on test strips, we have very hard water!
water temp: 80F