How long has this wine been in bottle? If it is just sediment that has dropped out over time, it's not a problem. Reds often drop out some polymerized tannins and tartrate crystals after some time aging in bottle. It shouldn't be "floating" though, unless it has just been disturbed when you picked up the bottle. If everything smells and tastes fine, Just decant off the sediment when you drink it.
Another possibility is that you simply bottled too soon... I made that mistake with a Cab Franc once... it looked clear so I went ahead and bottled it. But after only a few months in bottle, it dropped a major amount of sediment... in retrospect, even though it looked pretty clear, it obviously wasn't fully clarified yet and it finished clarifiying in the bottle.