Make Kog'maw q more visible
You riot made many other changes like this to make ability effects clear and kog's q is almost invisible (I mean after hit)
If he lands it, reduces armor and mr 28% (maxed). That means if you're a tank with 200 armor/Mr you lose 48 of each for 4 seconds and probably neither your team or enemy team knows.
A shield melting, similar to vi pasive should make it much clear.