these things look horrible IMO
if you don't want coral go fowlr , plastic reefs just don't have any true life characteristics
and the fish wont benefit from them plus over time they just start to deteriorate been there done that , with live coral things always are changing as things grow plastic don't grow and change ,
me personally if it don't look real it's just a waist of your good hard earned money , I don't encourage instant reef just drops in insert and be done, you'll learn more from your tank with living organisms and coral, your spending all that money to start a saltwater tank why waist that money on a $80. insert , not all live coral costs a small fortune ,
actually for that $80. you can buy $10. frags and they will spread over time and you can build from there you'll be happier in the end , there are a lot of online vendors who sell cheap frags , fake just looks horrible in a saltwater tank , and IMO a big waist of money .
just realize the amount of work maintaining a fake insert tank to a live coral tank is about the same except you don't get the joy of seeing things grow and spread natural tanks provide a natural filtration as plastics do not , something to think about ,
remember taking short cuts don't make it easier it just leads you to be unhappy over time , wishing you went live from the start , another thing to consider is the fish's natural environment , a lot of saltwater critters like to burrow into rocks with a fake inserts these critters hermits /shrimp / crabs can't do there normal activity's , and most likely wont be happy