I loaded up the Pico+Mellow3-Mini with a Ni-CCell. It worked fairly well however after leaving it on my desk while I was at work I came home to find the coil was flooded and refilling the tank resulted in floods out the air holes in the bottom.
Needless to say I was not at all pleased. Maybe not a fault with the Mellow3 but with the 3rd party "CCell" but I then started looking for other tanks to match the Pico with. Shown are three different builds on STM's that functioned well, however the STM seemed to tall for the Pico.
Onto plan "C", I had purchased a Triton2-Mini at the same time as the Pico+Mello3 kit and while unpacking realized that the stock Triton kit likely did not include TC coils. Ahhh... I found a stash of VaporShark Nautlius Ni coils and primed one up and installed on the Pico. This seems to be a good match other than the reduced output of the Trition2-Mini (it does use Nautilus coils after all!) and the reduced tank capacity. The size/weight seems to work.
Pictured below is my current favorite setup on the left (Boxer22650+OBS Crius) the Pico+Trition2-mini in the center and my old (mostly defunct) TC40 with a Aspire Maxi mounted on the right.
I've used/tried: Ti, Ni, SS430, NiFe48 and NiFe30 on the Pico with decent results. The menu system takes a little getting used to coming from Joytech products and the silly new/old coil issues many of these mods have may be carried over to the Pico. Luckly I tend to "pair" a tank with a Mod and with top fill there is no reason to dismount the tank until the atomizer needs rework.
What a fun little mod! It may gain a place in my coat pocket as my backup mod.