Crab setup for air intake question

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kaz

Aquarium Advice Addict
Joined
Sep 19, 2005
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Location
Los Angeles
I have a ruin roman building that is hollow inside for fish to get in and it reaches about 2 to 3 inches before the surface of water, center of aquarium. I know that the crab need to get to surface for air, what can I use for it to reach and if it ok to place it on the roof of ruin building to give just that extra inches to reach surface. today I found him at the top of ruin building on the inside though. I can imagen then that on the outide back panel of the ruin its pretty solid and incline to him to climb, or should i just get a big plant or something else to reach surface? if this doesnt make any sense sorry I'm in a rush moving to another house.
 
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