Minimum Tank Requirement for Lawnmover Blenny?

I recently discovered lawnmover blenny in the LFS and I just can't stop thinking about it, I don't know if it's their sand sifting behavior or frog-like face but they are soooooo darn cute to me! There weren't many information about this fish, guess most people just use it as a tool.

I only had freshwater aquarium before because it's cheap and doesn't take much time, so I'm just thinking hypothetically, what would be the minimum requirement for one single lawnmover blenny? Would it be a good practice before I really start a proper saltwater aquarium?

Think I'll need:
A tank (what's the min. size? 10 gal?)
Heater (I have a 50w adjustable)
HOB filter (I have AquaClear 20)
Light (does it need special light?)
Live sand?
RO water
Marine salt
Algae wafer or other type of food for the blenny
Saltwater Testing kit


Is wave maker necessary for this tank? Heard they are expensive.
I don't know anything about corals-I can get some if needed, or whatever that helps stabalize water quality.

Do you guys think it's feasible? Or is it a bad idea? I don't think there is anything like lawnmover blenny in freashwater.

 

I think they need like 30? They get bigger than you'd think. Closest freshwater fish I can think of would be a stiphodon goby which do stay smaller.

 

I think they need like 30? They get bigger than you'd think. Closest freshwater fish I can think of would be a stiphodon goby which do stay smaller.

You are right! I didn't think it can grow to 6 inch! Would you say it can live in a 30 long with just sand and deco then?
I googled some fresh water gobbies and the most similar one is medskippers which I never seen in any local shop, so I'm still thinking about this lawnmover blenny...

 

They need lots of rocks with good algae growth to graze on

 

I saw a full grown one at my LFS and it was an absolute monster. About 6-7 inches long and about an inch thick. Lawnmower Blennies definitely have unique personalities but you will definitely need to supplement algae tabs in their diet and I would say you should have a 4 foot long tank for one to keep one long term given how big they get. They also tend to get grumpy as they mature.

You could look at a Tailspot Blenny as they stay much smaller but will have similar grazing characteristics and more color to boot.