Bare Bottom Pros and Cons

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Peppie

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bonney lake wa
I am putting together 70gal AIO, Considering going with bare bottom. How do you keep the rock off the bottom, How did you keep even flow at the bottom? Did it work as you expected? How much filtration do you lose by not having substrate?
Any pics of those that do have bare bottom?
 
I wouldn't be caught dead without a bare bottom tank! Since I switched from sand, I never went back to it. Flow can be placed anywhere in the tanks so you don't have to worry about sandstorms. Also, it helps in keeping waste in the water column rather than buried in the sand. Biological filtration wise, the rock provided all I ever needed. Infact, it wasn't until I went bare bottom that my nitrates went to zero. As for what I put under the rocks, I didn't lift mine at all, but put a white pvc board bottom down (similar to starboard). Here are a few pics to show you some of my bare bottom tanks. :)

Here's my 75 gal that was bare bottom




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38 gal cube bare bottom





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And my 24 gal apuapod I changed the back wall out in to blue acrylic and put down the white bottom.






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I think they all look good. I have some FRP some call it wiggle board. It is a fire resistant fiberglass sheet about 3/16'' thick. Its the stuff you see in the restrooms at HomeDepot. Would this work for the bottom? I am not wise to the star board, Were can I get it and how much is it. I'll need a piece that is 36 x 18
Thanks for the info and pics Kirsh
 
I think they all look good. I have some FRP some call it wiggle board. It is a fire resistant fiberglass sheet about 3/16'' thick. Its the stuff you see in the restrooms at HomeDepot. Would this work for the bottom? I am not wise to the star board, Were can I get it and how much is it. I'll need a piece that is 36 x 18
Thanks for the info and pics Kirsh

No problem!:) As for the wiggle board, I've never heard of it. Starboard is what a lot of people use to make doors, hatches etc for boats. It's like white plastic basically. The pvc board I bought from a local plastic company here that sells any type of plastic you can think of including acrylic. The pvc board is lighter than startboard and cheaper. Not sure where in the US you would look for something like that, but my best guess would be anywhere that sells plastic/acrylic. My friend said it comes in a a sheet like wood (4ft x 8ft) which you can have cut to size.:)
 
I like the sand look but do not like sometimes my wrasse gets into it and throw sand onto my lps. My other tank is bare bottom, now worries with sandstorm. The outside bottom is sprayed paint white to create the sand look. When coraline algae builds up I go in and scrape it off.
 
No problems with rocks sliding around in both tanks. 65g with sand has large base rocks. 45g (frag tank), rocks are 5"-6" tall and eggcrate sits on top.
 
Cons:
>You loose alot of biological filtration, so your cleaning/maintence is in realtime. As in if you just allow detritus to collect, you will see algae break out quicker.
>No matter what you use on the bottom it will turn purple with corraline
>You will loose the alot of area for bugs and critters to reproduce, so less pods, worms, larvae and so on on.
>Forces you to keep a regular maintence schedule, or the detritus builds quickly.
>Looks more like a natural enviroment.

Pros:
> you can increase flow in the tank to levels you couldnt with sand substraights.
>If the flow is setup properly you can dicatate where the detritus builds for an easy removal.
>Because you have to do detritus removal constantly, you will not allow it to build up or sink in your system. Thus saving a tank altering clean up down the long term road.
>Keeps the detritus in the water column and makes it more available to corals and similar.


On the bottom the white plastic being refered to is what we know as cutting board material, usually aly place that sell acrylic sells it. Its a good idea to have as if you drop something heavy on the bottom it will protect the bottom from damaging.

On one of my tanks I took epoxy and would paint an area and then while it was still wet I would stick some sand to it. Then do that to the whole bottom of the tank. It worked well for the slipping thing, but eventually covered in corraline

Mojo
 
Thanks Mojo
That is what I was looking for from this post. I will be going bare bottom. You have tipped the scale with your reply.
 
One of the big cons for BB is the loss of that bug/larvae bio divercity. A good way to help bring that back inot the equation is to set up a good refugium. This will allow you to get those things back into the tank, by either them being swept out or by harvesting them and introducing them (pods) back into the tank

hope it helps

mojo
 
Something to note about elevating the rocks: This can be achieved by using acrylic rods cut to lenght and either epoxied to rock or tiered eggcrate grids or have a number of acrylic 1.5" squares pre-drilled for random peg insertion that you could epoxy or silicon to tank bottom area that allows you to support your rock or frag colonies at random. The last is what works for me and what I will incorporate in my next build.
 
Yea Aquanut all my rock is put together like that with acrylic rods. I would just look at a couple of rocks and decide how I wanted the to look attached to each other. Then I would drill both rocks with a long cement drill bit and join them using a acrylic rod (1 inch for the big fellows and 1/2 for the smaller ones). It was kind of like lego for adults?? For rocks on the bottom as aquanut mentioned you can drill and glue in little legs of acrylic rod to, also if you find a nice long peice you can take it to the chop saw and cut off the bottom (making it flat) that way it glues down easy and mkes for some nice columns sticking straight up.

just use your imagination and dont worry to much about hurting the rock

mojo
 
Thanks Guys
The tank is going to be an AIO. I will have a chamber for micro-algae with a light 18hrs on 6 hrs off. This will help some with the bugs.
As for the bottom and rising the rocks I am not sure yet. It will be about two weeks befor I get to that part of the build. I have a little time to think about it.
Again thanks that is good info
 
Yea Aquanut all my rock is put together like that with acrylic rods. I would just look at a couple of rocks and decide how I wanted the to look attached to each other. Then I would drill both rocks with a long cement drill bit and join them using a acrylic rod (1 inch for the big fellows and 1/2 for the smaller ones). It was kind of like lego for adults?? For rocks on the bottom as aquanut mentioned you can drill and glue in little legs of acrylic rod to, also if you find a nice long peice you can take it to the chop saw and cut off the bottom (making it flat) that way it glues down easy and mkes for some nice columns sticking straight up.

just use your imagination and dont worry to much about hurting the rock

mojo


Mike do you still have your website up?? I remember seeing pictures in there with you guys strapping rocks together etc. If it is still up, post a link. :)
 
No we took it down a few years ago because we were pushing the limit for server space and didnt want to have to up grade to a dedicated, mind you know we have blown past that, lol I will take a look on my computer and see if I can find it anywhere

mojo
 
Hey found a couple pictures, first one is drilling holes to drive a peg down to stablize the rock
zipdril.jpg


then one where we drilled a hole for doweling two rocks together
dowel_drill.jpg


Banging the dowel home
tapping_dowel.jpg


From their it was just a matter of peicing it together
Fgallery4-3.jpg
 
Cool...Thanks!!! Nice hammer too!! You should have spun it around to freak out the guy holding the rock. :lol:
 

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