Alien maze brain. Does water current determine the "lumpyness"?

[River_Styx]

I'm looking around for an alien maze brain and some I see have very thick/lumpy edges while others do not. Is it just the coral or does current also influence it?

Lumpy: http://i141.photobucket.com/albums/r54/MsBeanCtr/WormBrainCoral.jpg

Non: http://www.tfhmagazine.com/assets/006/20434_400wh.jpg

 

[Triggerman77]

Different corals. Diff species Dont think flow will make that change LOL