We are working on a seastead design that will have a 40 by 16 foot living area above the water.
There will be 4 foot wide columns that are about 20 feet long going out from 
from the 4 corners of living area and down into the water at 45 degrees, which half of
each column under water.   The bottoms of the floats will make a rectangle about 44 feet wide and 68 long.
From the bottom of each column there will be 
2 cables going to the adjacent corners to hold it in place.
There will also be a cable making a rectangle between the bottoms of all the floats so we have some
redundancy in case one cable breaks.
The seastead is about 30,000 lbs I think but this is NOT a normal boat hull shape,
it is more like a tiny oil platform as far as drag.

We expect to use 2.5 meter diameter propellers on two submersible mixers and solar power to move
at around 1 MPH plus any help from using eddies.


I want to use this seastead as a Fish Aggregating Device (FAD) and so was thinking to let some
marine growth happen.   I understand that this increases the drag.  I may be happy to go 
0.5 MPH if there is always really easy fishing.   

But please discuss options like:

1) Cleaning every 6 or 12 months and how much total weight we might get in that time.
     If some plant is growing and it has the same density as sea water it would not
       really be pulling down on the seastead.  So we are particularly interested in growth 
       that uses up some of our buoyancy reserve.

2) just cleaning things that might be harmful to duplex steel floats or cables
3) other options?

If there is algae growing on a surface does that make it harder for barnacles to attach?
I wonder if we might have less monthly work removing barnacles once we have a good cover of algae.


I imagine that there will be ROVs designed for cleaning boat hulls soon if not already.
Do you know of any?   Are there businesses that do hull cleaning using ROVs?   
What are the cheapest ROV for cleaning hulls?

We could have an ROV that could be controlled from a cable connected to the internet with Starlink
so that someone far away could operate it.  We could have some team of trained and qualified
operators/inspectors who did regular cleaning.  So the owner of the seastead just needs to hook up
the ROV and put it in the water at the right time and some expert then could do the actual
cleaning and inspection from far away.

If we did a selective cleaning ever month or so how many hours would you expect this takes
after things sort of get to a steady state in 6 months or whatever?