Starting a Vivarium (50%land, 50% water), for my Punggol crab Marine

[cdckjn]

I caught several small big crabs (I think cannot eat type) from the Punngol beach. I placed them in a betta tank for the night, but in the morning discovered that they have all managed to climb over into the main tank. So after a week, I discover that all my fishes are swimming tio the surface. The reason because one of the bigger crab is occupied the rocks and the fishes are scared of the crab.

So I got fed up and last night managed to use the tongs and catch the crab out.

Now I am stuck, and after observing the crab for a week, got quite attached to it. So I will not create a vivarium for it as well as catch the small crab from the main tank to join this fella.

It will be smiple, some rocks, about 1 inch of water and then see how long these crabs can survived as I know that during the low tides they can survive like 4 hours in the hot sun without water.

Will post pictures tonight when the tank is set up.

[fotoudavid]

those crab you catch is it those thunder crab?? It can grow quite big.

[Shaihulud]

Those marine thunder crab will need saltwater eventually. Hope you suceed.

[cdckjn]

YES it is thunder crabs. I have a marine tank at home so no problem with the salt water.

This is going to be a very very low-tech tank, the water will not have a filter, I intend to just do water changes by pouring in new water - high tide, then later suck out some of the water back into my sump - so becomes low tide again. This will occur at least once a week - water change. no mangrove as my balcony has only natural filtered sunlight. Maybe go and catch one more goby to accompany the crabs.
The live rocks and stuff will be the "land".

[eddy planer]

YES it is thunder crabs. I have a marine tank at home so no problem with the salt water.

This is going to be a very very low-tech tank, the water will not have a filter, I intend to just do water changes by pouring in new water - high tide, then later suck out some of the water back into my sump - so becomes low tide again. This will occur at least once a week - water change. no mangrove as my balcony has only natural filtered sunlight. Maybe go and catch one more goby to accompany the crabs.
The live rocks and stuff will be the "land".

so much work, change marine water weekly? Use1/4" Y connector fittings and 1/4'' hose to connect the sump pump will do. You can even create rain bar to constantly dripping the live rock.