07-20-2012, 11:21 AM
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Check your specific fish for their normal temperature. Some can be on the lower side, like 77 max, which 86 may be a bit hard on them so go with 84 instead. Others are fine at 80-84 to begin wtih, so 86 isn't an issue for a short time period.
3.5g is really, really tiny and can not hold a cycle on its own. I wouldn't use it for QT as the stress of ammonia/nitrite would be more apt to make them sick which you are trying to avoid in the first place.
A basic 10 gallon bare tank is really inexpensive. You can use a basic sponge filter for a tank that size. No need for light fixtures on a QT tank (dim lighting = less stress). Once the sponge is fully seeded with bacteria, you can just leave it in the main tank behind some decorations/plants where it will not be seen. It does not have to be running to stay loaded with bacteria. Then when QT is needed, you just move it into the QT tank and you are good to go. If nothing happens during QT, you can just move it right back to the main tank. If something crops up, you can bleech the sponge or buy a new one for cheap, just keep in mind it will take another 4 weeks to re-seed the sponge.