Bare Bottom Floating Island Reef Build - Need Advice

ETTORE0892

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Hi everyone,

I have a small update about my new tank.

My new custom reef tank should arrive next week. It will be a 100 × 60 × 55 cm sump tank.

Recently, I built a floating island style aquascape using Java rock. The structure will be supported from the back by an acrylic bracket, so the main reef island will appear to float in the middle of the tank.

The floating rock structure is about 60 cm wide and weighs around 5 kg. I plan to place it about 15 cm above the bottom of the tank.

There seems to be quite a lot of dust on the rock surface after building the aquascape. Before putting it into the new tank, should I rinse it thoroughly with freshwater, or should I only rinse it with saltwater? I want to remove as much dust as possible, but I also do not want to cause any problems later.

For now, I do not plan to use sand in the new tank. I want to keep the bottom very clean and easy to maintain, and I also want to be able to see and remove detritus more easily. I know bare-bottom reef tanks look different from natural sand-bed tanks, but I think it may match this floating island design.

My plan is to keep mostly LPS corals, including hammer corals, torch corals, Goniopora, brain corals, Elegance coral, leather corals, and green star polyps. In the future, I may try a few easier SPS corals.

Before I set up the tank, I would really appreciate some advice:

  • Is this kind of floating island aquascape suitable for an LPS-focused reef tank?
  • What should I pay attention to with flow around and under the island?
  • Is a bare-bottom setup a good idea for this style of tank?
  • Are there any problems I should think about before the new tank arrives?
I will share photos of the aquascape soon. Any suggestions are very welcome.

Thank you!

2026-07-02_03-56-50_503.jpg 1782935793771-1464081305.jpg
 
Java Rock? Is this aragonite (coral skeleton) or something else? It looks like coral skeleton (aragonite), and I would rinse it it fresh water without concern to remove dust that may be present.

The only other concern I would have with growing LPS (or any other coral) is if the acrylic island support failed, especially as the tank matures and coral colonies gain mass?

SHould be beautiful!
 

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