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Do Marine Shrimps Eat Crabs?

i have recently started a marine fish tank, it holds 190 litres, i have live rock and sand in my tank. in the first 2 weeks it was empty until a crab the size of a £2 coin came out of the rock also 3 very tiny crabs but the tiny crabs were dead but the big crab named oscar was doing very well. a few week’s later we checked the ph and everything was perfect so we added 2 cleaner shrimp, 5 snails and 2 hermit crabs. another 2 weeks later we checked the levels again and everything was great so we added 2 fire shrimp, 2 black and white clown fish and an anemone, on saturday i noticed the cleaner shrimp were excited when i took a closer look i seen they had one of the red leg hermit crabs and they shredded him apart limb from limb, then on monday i seen some excitement with the fire shrimp and i watched in horror as they pulled the top shell off of the big crab oscar and killed him. i cant seem to find any information about shrimps killing other animals in the tank and i wondered if anyone else has experienced this or if anyone knows why it has happened.

Whats The Best Way To Cycle A Marine Tank?

I have had different aquarium shops tell me how to cycle a salt water tank, some say you should cycle a tank with just live sand and rock. Or with both and fish. I have live sand and dry base rock, i will put some live rock on top on the base rock. My original plan was to let the live sand and rock cycle the tank by its self w/ out fish. But the other shop told me i needed some fish to feed the bacteria in the sand and rock for it to cycle. So should i get a couple fish like a clown, or damsel? Or stick with my original plan? Iv seen on youtube http://www.youtube.com/watch?v=cD2yMCTEzQYfeature=channel
this guy cycled the tank with just live sand and rock and no fish and then fully changed out the water after the cycle with real ocean water. Should i do that too? I don’t have access to real ocean water though. I figured you would want to keep the cycled water because then it is ready if you empty after the cycle then whats the point of cycling it?

What Are The Most Colourful Fish For My Marine Fish Aquarium?

its 50 gallons and it is 7 weeks old

Marine Tank Surface Scum?

i have a newish marine tank, its a 130LT red sea max, been set up for 4 months minimum, i have 2 fish and a crab in there at the moment, i just cant seem to shift the surface scum from it, no matter how i set the skimmer or where the collection cup is and however often i clean the crap from the cup it wont move?? do you know what im on about??? can you help?? how can i get this crud to move from the surface?>?

How Do I Set Up A 15 Gallon Marine Tank?

I have an old 15 gallon aquarium that I used to keep freshwater fish in. I want to make it into a marine tank for some small inverts. What do I need other than a heater and a filter? and how much salt would i need to put in?

What Could Live In A 15 Gallon Marine Aquarium?

Is there any type of crab or shrimp that could live in a tank that size?

Marine Biologist Help?

I want to grow up to be a marine biologist for a while(first it was a oceanic photographer)Anyways I’ve been studying a lot about the ocean and it’s life,i have a couple areas i would like to go in to,I would like to study Coral Reefs and Esuteries/brackish water ,i would like to teach people to treat the oceans better,I would LOVE to study the fish and inverts.(more or less Dark zone animals),and I would love find ways to preserve our oceans and Coral Reefs.I also want to be one of the biologist who dive AND works at a lab.Also if i wanted to make at LEAST 55,000$ what areas would i need to know and study.I really want to be a marine biologist,I have four aquariums :) One is saltwater,the next will be brackish :) So where would be a good place to live?Florida?Spain?California?
And the other two subjects,if their are any Ecologist and Environmentalist i would love to help fix the oceans and lands of please tell me what areas to go in :) lol. Also what other things would be good for me since I love the environment and aninmals?NO ZOOS or VETS!!!!I would mind owning a exotic pet shop :)
I’m 14 and want to study the sea :)

Whats The Difference Between A Wave Maker And A Submersible Pump For A Fish-only Marine Aquarium (100l)?

A wave maker is something that is timed release or pulses/bursts of water to simulate wave action. There are wave maker boxes, wave maker pumps, wave maker switch valves, and wave maker machines that power two or more submersible pumps or power heads.
A submersible pump has a stead speed and outputs water at a constant rate. As I referenced above, many submersible pumps have the ability to be hooked up to a wavemaker control system.