Ark of the Month is the seventh stage in Castle of Fish.
The only peon that appears is Those Guys , with a respawn rate of 3 to 20 seconds.
One Sir Seal appears after 40 seconds into the battle, and continues to spawn every ~6.6 to 20 seconds.
Two more Sir Seals spawn after the enemy base reaches 80% and 60% health; That is 120000 and 90000 HP respectively.
An easy way to beat this stage, is to simply spam Giraffe Cat as they attack fast enough to dispose of all of the enemies.