Originally Posted by
reefkprZ
http:///forum/post/3178003
I disagree. appearances can be decieving.
a diamond goby is a predator. it will eat the benificial microfauna out of the sand bed and leave the detritus behind, making for a less healthy sand bed. while it appears to be doing a better job cleaning its just hiding the waste by turning it over fast. though you do get some benifit from the rate it kicks up the sand by re-suspending some of the waste for your filtration to catch.
a tigertail cucumber is a detritivore, feeding on fish waste excess foods etc. not preying on the small animals in the sand bed that keep it healthy. while it doesnt seem to be doing much the cucumber actually re-processes more waste utelizing more nutrients that would just have to break down in-situ.
Very much agree. A sand sifting cucumber is better for this. Having said that, they should never be added just because. They need a particular sediment size, and a mature tank with reef parameters.