Just when I started to think that things had calmed down in my aquarium.... My fish have been flashing. My 3 clown loaches, which I've had for about 6 months, have always flashed rarely, like once every 2 weeks or so. But for the past week, 3 of my rosy barbs have flashed at least 2 or 3 times a day. But until today everyone has seemed healthy and active, except for the occasional flashing. Then today, one of my clown loaches, usually the most active one, has been hanging out under a rock all morning, and when he finally came out for a bit, what did he do? Flash and scratch himself on the substrate. Now, granted, his belly is also stuffed from his breakfast, so maybe he's just been under the rock napping and digesting his food. That wouldn't be totally unusual for any of my loaches. In other words, there are no sure, unambiguous signs of disease. I've heard that some flashing is normal, and my loach may just be having a lazy morning. The only possible culprits for causing an illness would be a new clown loach who I put in last week, but who had been healthy in qt for 3 weeks before that (though with no proactive medicating). I also added some new plants about a week ago, but I kept them in qt for 3 days, and scrubbed them really well (I assumed that if a gravel vacuum can suck ich cysts out of the gravel then a good scrubbing should dislodge them from plants.) Plus the plants came from a plant-only tank at the lfs, which reduces the odds that they were carrying ich in the first place. I also switched from Stress Coat to AquaSafe water conditioner last week. Maybe the AquaSafe is somehow irritating them? With no outward signs of disease besides flashing and today's lazy loach, I really hesitate to dump meds in the tank. But I don't want to hold off treatment until some disease gets out of hand. My first suspect is ich, I guess, though there are no white spots. I am most worried about proactively using ich meds, because I have _never_ treated with ich meds that did not ruin my biological filter. The first time was last fall, when I bought the 3 clown loaches and did not qt them. They had ich, and I treated with Rid-Ich+ and went through a horrible ammonia cycle. The second time was when I bought my rosy barbs and I treated their qt-tank with Coppersafe as a preventative measure, and within 10 days the good bacteria were apparently wiped out, judging by the ammonia spikes. I'm sorry this post is so long (all my posts are way too wordy--it's a bad habit when I'm stressed!). But does anyone suggest medicating my tank, and with what? I was considering the new Maracide, but I'm not sure it's safe for loaches