06-30-2012, 02:07 PM
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I have maintained Farlowella vittata [this is probably the correct species, it is almost always labeled F. acus, see the profile (click the shaded name) for more explanation] for several years and spawned them. They do not like being moved, even from one tank to another in my fish room, and they can take up to several weeks to settle. They also are highly sensitive to water parameters and conditions, as noted in the profile.
They need shade, and lots of surfaces. Plants are basically essential, as this fish naturally grazes every plant leaf for algae and tidbits of microscopic food. This is their main source of food, so make sure you have this. Once they are settled, they usually learn to eat from sinking foods, and they will eat during the day with the other diurnal fish. They are also active at night, but so is your pleco so it might be getting the sinking foods.
The issue with the other fish I will not comment on since i have little if any experience with health problems like this and I will not guess. Hopefully another member will recognize it and be able to offer advice.