For insane, after you get the two free food chambers and some soldiers running, wait for the water to drain and then dig out to start alternating between overground and underground food. The hardest chambers to clear are the two with four adult rove beetles, so you want to be working towards a...
I would like to point out that the main balance issue with the wood ant melee soldier is not that it's weak compared to other species, but that it's not very effective compared to wood ant workers. Melee wood ants need an edge to ensure that they are the most viable tank within their own nests...
I think I've already done this in freeplay. I believe they either get dropped and don't die, or the spider struggles with them for a minute until they die.