Sound decent is highly subjective, there are guys out there de-tuning Fenders but no bass is really going to sound that great that low. What kind of cab will you be using? That will play a big role in how decent your rig will sound, not all cabs can reproduce those lows.
Oh and low G(0?) can definitely be heard, there are plenty of guys who tune to F# and at least one cat going to C#, the low C# is where the debate opens up about human recognition. I am not opening the debate, just tossing that out there. Last time I said nobody argues about hearing E0 but some guy posted something on the next post, so I don't want to paint a broad stroke with my brush here.
Have you played a bass tuned that low? I played a fanned fret F# and it had terrible wolftones by the first fret, I personally did not like it but I wish you the best in your endeavor. I would not worry about it sounding "weak" unless you run it through a 4" speaker, that bass will have a thud that kicks you in the chest with a low G as long as your rig can push it.
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