Received from: automatically after listening to a conversation between Kargesh and another krogan [Citadel - Zakera ward]
Description: This quest will automatically appear in your journal after you've listened to a conversation between two krogans encountered on the 27th level (first screenshot) of [Citadel - Zakera ward]. Go to the Dark Star club (level 28) and talk to the Presidium groundskeeper to find out if the rumors about the fishes are true.
You may return to level 27 and choose between one of two endings. If you want to lie to the krogans (renegade points) you can buy a special kind of a fish from a nearby Citadel Souvenirs store run by Deleia Sanassi (first screenshot). If you want to tell krogans the truth (paragon points) you can return to them right away and share the news (second screenshot). In both cases you would be rewarded with 1000 credits.
Description: Khalisah al-Jilani is a TV reporter and you may remember her from the first game. You can find her on the 28th level of [Citadel - Zakera ward] and agree for the interview. Notice that you're allowed to stop the interview at any moment of the conversation and if you find her questions too aggressive you can even use a renegade interrupt (second screenshot) to... knock her out!
Crime in Progress
Received from: automatically after listening to a conversation between Lii'Vael, C-Sec officer and Kor Tun [Citadel - Zakera ward]
Description: This quest can be activated in a similar way to Krogan Sushi, because all you have to do is to find a group of NPC's on the 26th level of [Citadel - Zakera ward] (first screenshot) and listen to their conversation for a few seconds. Talk to them and take your time to listen to what each of these characters has to say.
Promise to help out and proceed to a nearby Saronis Applications store. Talk to the owner Marab and you'll find out that Kor Tun has left his credit chit here by mistake. Return to the group and inform them about your discovery. An interesting is that during the upcoming conversation you can use a paragon interrupt (second screenshot) on the C-Sec officer and Kor Tun for not making any apologizes. Completing this quest will result in receiving 1000 credits.
Received from: automatically after finding forged ID's or automatically after listening to a conversation involving Kalara and another asari [Citadel - Factory district or Citadel - Zakera ward]
Description: There are two ways of activating this quest - the first one is to begin a personal mission for Garrus called Eye for an Eye. You would have a chance to pick up the forged ID's during your exploration of [Citadel - Factory district] map - it's a control room you'll have to explore as you're about to begin the last series of fights (first screenshot). An alternative way to start this quest is to visit the Citadel later in the game and to listen to a conversation between Kalara Tomi and another asari. They can both be found on the 27th level of [Citadel - Zakera ward] (benches near the western staircase).
This quest also has two different endings. If you've found the forged ID's and if you're playing as a renegade you can give these objects to Kalara and her friend. If you intend to score paragon points you can go to the C-Sec customs office - this is the area where you start the exploration of the Citadel. Talk to the Customs officer here. By choosing one of the special dialogue options you can convince the officer to allow Kalara to leave the Citadel. In both cases you'll be rewarded with 1000 credits.