Name some disadvantages of epibiosis

Disadvantage for epibiont: - trophic competition with basibiont - environmental changes if host migrates Disadvantages for basibiont and also both in manyy cases: - if booth are food for same predator (shared doom) - also musle covered by barnecles are easier to crush for crabs (associational susceptibility) - competition with epibiont (exploitation) - competition for nutrients (algee) - reduced reproductive output