I put down my forth BIAB AG on Saturday and the fermentation is going well so far (OG 1.045 currently at 1.030) I am fermenting reasonably low as I am not in a rush

After taking a sample today I noticed there was no hop aroma at all? Would some hop aroma be present half way through fermenting? The wort tasted malty and still sweet.

Should I dry hop after it has fermented out? It's an American Brown Ale style brew.

Should I dry hop with Citra or Galaxy or both? how much? Would 30g of each be enough? too much? not enough?

Thanks in advance!

Recipe:

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BIAB ABA - Batch 4

Recipe Overview

Brewer: BungBrew
Style: 10C American Brown Ale

Original Gravity (OG): 1.047
IBU's (Tinseth): 30
Bitterness to Gravity Ratio: 0.64
Colour: 47.4 EBC = 24.1 SRM
ABV%: 4.55

Efficiency into Kettle (EIK): 83.6 %
Efficiency into Fermentor (EIF): 75.4 %

Note: This is a Pure BIAB (Full Volume Mash)

Times and Temperatures
Mash: 90 mins at 67.8 C = 154 F
Boil: 90 min
Ferment: 21 days at 17 C = 62.6 F

Volumes & Gravities
Total Water Needed (TWN): 36.33 L = 9.6 G
Volume into Kettle (VIK): 34.62 L = 9.15 G @ 1.036
End of Boil Volume - Ambient (EOBV-A): 25.53 L = 6.74 G @ 1.047
Volume into Fermentor (VIF): 23 L = 6.08 G @ 1.047
Volume into Packaging (VIP): 21.3 L = 5.63 G @ 1.012 assuming apparent attenuation of 75 %

The Grain Bill (Also includes extracts, sugars and adjuncts)
83.3% Pale malt (6 EBC = 3 SRM) 4036 grams = 8.9 pounds
5.2% Munich I (16 EBC = 8.1 SRM) 252 grams = 0.56 pounds
5.2% Rye (8.5 EBC = 4.3 SRM) 252 grams = 0.56 pounds
2.1% Midnight Wheat (1465 EBC = 743.7 SRM) 101 grams = 0.22 pounds
2.1% Chocolate (1175 EBC = 596.4 SRM) 101 grams = 0.22 pounds
2.1% Brown malt (500 EBC = 253.8 SRM) 101 grams = 0.22 pounds

The Hop Bill
11.3 IBU Citra Pellets (11.9%AA) 9.3 grams = 0.327 ounces at 60 mins
10.1 IBU Galaxy Pellets (13.9%AA) 9.3 grams = 0.327 ounces at 30 mins
8.6 IBU Citra Pellets (11.9%AA) 9.3 grams = 0.327 ounces at 30 mins
0 IBU Galaxy Pellets (13.9%AA) 18.5 grams = 0.653 ounces at 0 mins
0 IBU Citra Pellets (11.9%AA) 18.5 grams = 0.653 ounces at 0 mins

Mash Steps
Mash Type: Pure BIAB (Full Volume Mash) for 90 mins at 67.8 C = 154.04 F

Miscellaneous Ingredients
0.5 Whirlfloc Tablet (Boil) 5 Mins

Chilling & Hop Management Methods
Hopsock Used: Y
Whirlpool: 0 mins after boil end.
Chilling Method: Immersion Chiller

Fermentation& Conditioning
Fermention: Safale US-05 for 21 days at 17 C = 62.6 F

I ended up dry hopping with 25g Galaxy and 25g Citra .. smells pretty good now