hp cubic:
"high cooldown between heals (at least 13 seconds) won't really help you handle a zone just because of it. Its heal power increase when your skill level increase, starting from 201 HP at level 40 to 382 HP at level 72. The less HP you have, the higher the chance for the cubic to trigger will be."
"This cubic can trigger 20 times with a 13 seconds cooldown, and then its cooldown will increase to 65 seconds."
aqua cube:
"This cubic is a water dot (Damage on Time), reducing the target's HP over time. It starts at 102 HP lost per second at level 40, and goes up to 164 HP per second at max level and will stay for 15 seconds. An in-depth experiment has been done here showing that neither weapon, INT, WIT nor magic accuracy change its land rate or damage. Simply put, if you want it to land level it up. It will also only trigger if your target has more than 1k HP leftThe DOT will have a cooldown of 30 seconds between activations until it has triggered 10 times, then it'll be around 2m30 between each trigger."
the stun cubic is probably similar to aqua