Okay, I asked somebody else for advice on my orchestration and he went a bit into lower interval limits. He did however give me advice on orchestration for the first chord. Here is what he gave me:
Low C: Half of the Double basses and the Contrabassoon
Low Eb: Bassoon by itself
Low G: Half of the Double basses and the Bass Clarinet
Octave C: Cellos
Now, double basses with a C extension and with a 5th string are getting increasingly common. So it is likely that the double bassists will be able to play that low C with no problems. And I have seen a way that double bassists get an extremely low note to project out by flicking the string before bowing. But I'm wondering what I should do because here is what the lowest register of the double bass looks like in Musescore:
As you can see in the picture, anything below E natural is colored green. In Musescore, green means that the note can't be played by an amateur and red means that the note isn't even in the professional range. More specific to double bass, these low notes being green means that they can only be played if the double bass has either a 5th string or a C extension.
So I'm thinking of perhaps notating the double bass and contrabassoon an octave above the note I want, taking advantage of that built in octave transposition. So in other words I would notate it as a higher C(like the one at the top of the chord in the first image) and then because of the built in octave transposition, it would sound like the bottom note of the chord, C2. But then this raises the question of whether or not I should raise the notes in the other instruments by an octave as well to avoid muddiness in the sound(which is the reason why the person that gave me advice suggested the instrumentation above for the C minor chord).
So, should I raise the entire chord by an octave or just the low C in the double basses and Contrabassoon or should I leave it as is?