The fighting conch will controle both green and brown algie on top of sand, the snailes feed on waste,(I have boath and all seem happy) , they do difrent jobs.
Mine deserve the bad reputation award.I bought a mated pair of japanese pistols,and put them in my 10 gallon reef tank with a neon and yellow watchman goby , both gobies are MIA (beleve they were eaten) only fish left is a pajama cardinal!