Recipe for ROTTING SEA GOO is: ACID and RUINED SIGN. ROTTING SEA GOO belongs to category. ROTTING SEA GOO. For patient farmers for sure. Is this farmable? Good leveling up material if the answer is yes. How many times you need to hit it? Head to the wiki for more info: <a href="https://growtopia.fandom.com/wiki/Rotting_Sea_Goo">rotting sea goo</a> Seed mathematics is very complicated, but you should get at least 1 seed back from splicing ROTTING SEA GOO. Profiting with this might be questionable. Will you get enough blocks to build something? You just have to find out yourself.