Murky vs Raynor
Murky can not lane against Raynor. Raynor easily kills Murky's pufferfish and Murky. Plus Raynor has a self heal if you where to somehow get Raynor low. Murky can not even approach Raynor because of the Raynor's pushback. Bottom line - switch lanes.
Fish Tank helps with Raynor but Murky still can not go toe to toe with Raynor like other auto attack heroes because of Raynor's push back. It will help Murky get dmg/kills on other heroes while Raynor tries to blast Murky.