Lvl 1: Always take Bribe.
Lvl 1-4: analyze lane opponent:
-If lane opposition is weak and DOES NOT focus pufferfish: take
-lvl 4: Tufferfish
-If lane opposition is strong and DOES focus pufferfish: take
-lvl 4: Slime Time

Lvl 7: Time To Krill
Lvl 10: Octo-grab (Only take "March of The Murlocs if very desperate and your team is heavily struggling)
Lvl 13: Rejuvenating Bubble (most of the time). If they lack CC/burst and/or are melee heavy, can use Fish Tank well depending on positioning and timing of engagements.
Lvl 16: Toxic Buildup ---> (if in qm or messing around Wrath of Cod will guarantee your insta kill spike with octograb at this point)
Lvl 20: Big Tuna Kahuna