Blenny's and Golby

[Ronnell]

Hello all I have a NOOB question, what is the difference between golbys and bleenys. Do they replace a CuC?

 

[James M]

Blennies are rock dwelling fish and gobies are sand/cave dwellings. They don’t replace CUC too

 

[mort]

Gobies are normally bottom dwelling fish and there are some species that will stir the substrate, while others just sit around all day. Blennies tend to be more rockwork associated and most species eat algae or detritus.
So completely different with blennies being more useful as cuc imo but they help your cuc rather than replace them for the most part. I would only add a fish if you actually want it and not for what you think it may do.

 

[Ronnell]

I was just asking because i was in my LFS and I seen 1 shifting sand and I was wondering is it getting diatoms/detritus. I have some snails in my DT buried themselves in my (2-3") sand bed living the good life on these nasties

 

[Ronnell]

I was just asking because i was in my LFS and I seen 1 shifting sand and I was wondering is it getting diatoms/detritus. I have some snails in my DT buried themselves in my (2-3") sand bed living the good life on these nasties

This it the underside of my tank

 

[mort]

I was just asking because i was in my LFS and I seen 1 shifting sand and I was wondering is it getting diatoms/detritus.

They sift through the sand looking for food but not detritus or diatoms. These fish rapidly strip the sand bed of life, meaning all the little worms, crustaceans and beneficial critters that make up a healthy sand bed are munched. The up side is they aerate the sand and keep it healthy whilst also throwing the debris into the water column for your filtration to take care of.
So you need to decide if you want a natural untouched sandbed which might not look prestige but is healthy or a nice clean looking sand bed but with the downsides of sand piles everywhere and the extra care needed to keep a goby (that can be hard depending in species) going.