LauraFrog
Fish Gatherer
AFF will not fix this because it is bacterial, you really need antibiotics ASAP or you're probably going to lose more fish. Tetracycline/oxytet, or erythromycin/streptomycin/endomycin/kanamycin - any of those will work. It's definitely bacterial and it sounds like a bad strain of columnaris. Antibiotics are the only thing with a hope of curing it.
Loaches are scaleless fish, and AFF (going on the name) probably contains malachite green/methylene blue/acriflavine - scaleless fishes are sensitive to all of these and they will not like being in a tank at full dosage (most of these meds actually say to halve the dosage for fry, scaleless fish or tetras.) It shouldn't kill them, but I doubt it will get rid of the columnaris. Antibiotics, immediately, and you've got a chance of saving the fish that are sick. You'll need to put it through the tank anyway in order to kill this, because otherwise it's probably going to run through your entire stock. I recommend dosing ammo-lock or stress zyme while you treat with antibiotics, and you probably will need to clone your other filter. They don't discriminate about which bacteria they kill.
Most antibiotics can be dissolved in water and I've had good results on columnaris and septicaemia causing bacteria on tetracycline. Sorry to hear about this... good luck.
Loaches are scaleless fish, and AFF (going on the name) probably contains malachite green/methylene blue/acriflavine - scaleless fishes are sensitive to all of these and they will not like being in a tank at full dosage (most of these meds actually say to halve the dosage for fry, scaleless fish or tetras.) It shouldn't kill them, but I doubt it will get rid of the columnaris. Antibiotics, immediately, and you've got a chance of saving the fish that are sick. You'll need to put it through the tank anyway in order to kill this, because otherwise it's probably going to run through your entire stock. I recommend dosing ammo-lock or stress zyme while you treat with antibiotics, and you probably will need to clone your other filter. They don't discriminate about which bacteria they kill.
Most antibiotics can be dissolved in water and I've had good results on columnaris and septicaemia causing bacteria on tetracycline. Sorry to hear about this... good luck.