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Old 09-24-2011, 11:29 AM   #21
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I think they do this because coral spread.

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Old 09-24-2011, 11:32 AM   #22
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i was just looking at live aqueria where most are classified as semi or agressive
what is coral spread
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Old 09-24-2011, 11:33 AM   #23
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Not a saltie...but coral spreading means that they grow on all different sorts of places depending on lighting and flow, and some grow more faster and vigirously than others I guess, classifying them as semi-agressive or agressive. I wouldn't think all corals are like this but I'm sure there are some out there that are. Again, not a saltie, this is all from research.
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Old 09-24-2011, 11:44 AM   #24
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No there are non-aggressive corals as well. Usually aggressive means they have stinger tentacles they send out if they detect other corals and either duke it out like that, or chemical warfare
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Old 09-24-2011, 12:00 PM   #25
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can i have semi agressive corals in the same tank?
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Old 09-24-2011, 12:28 PM   #26
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Yes, you just need to make sure to place them where they cannot come into contact with each other when fully expanded.
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Old 09-24-2011, 12:35 PM   #27
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Can they be within reach of peaceful corals
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Old 09-24-2011, 12:38 PM   #28
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Quote:
Originally Posted by zacheyp View Post
Can they be within reach of peaceful corals
Anything within the reach of an agressive coral is subject to getting stung or hit with a chemical bomb. The peaceful coral isn't the issue.
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Old 09-24-2011, 12:40 PM   #29
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By reach you mean they can't touch right?
Can corals harm fish?
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Old 09-24-2011, 12:44 PM   #30
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By reach you mean they can't touch right?
Can corals harm fish?
At night when the lights are not on, they can put out tentecles. You want to be sure that other corals are not withing reach of the tentecles. liveaquaria.com gives a good listing of what the reach is. With things like hammers, they can give off chemicals so anything that is down stream in the flow of water will bet blasted. Yes, some corals can even eat fish from what I have read. I am no expert but do your research before you add anything and you should be fine.
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Old 09-24-2011, 01:23 PM   #31
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as stated, some corals have "sweeper" tentacles that can reach 4" or more. they can wipe out everything around them. these are not to be confused with the tentacles they put out at night to catch food.
some, like many leathers can release chemicals that can kill corals down current (in an aquarium, this could mean the entire tank).
some attempt to digest any corals that touch them.
and some just outgrow corals, covering them and shielding them from light, until they shrivel up and disappear.

as for corals eating fish, a sick/dead fish maybe. these rhizotrochus typus are the closest thing to an anemone IMO, but they are better because they have a calcium based skeleton and cannot wander!
they have the tools to devour a small fish. you can see by the zoas in the background the sheer size of them-
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Old 09-24-2011, 01:27 PM   #32
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Um I have 3 peppermint shrimp in my 90 gallon with my Longnose Hawkfish and sometimes he perches and stares at them but he never goes for them. BTW I have hermits and snails too.
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Old 09-24-2011, 01:32 PM   #33
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Quote:
Originally Posted by mr_X
as stated, some corals have "sweeper" tentacles that can reach 4" or more. they can wipe out everything around them. these are not to be confused with the tentacles they put out at night to catch food.
some, like many leathers can release chemicals that can kill corals down current (in an aquarium, this could mean the entire tank).
some attempt to digest any corals that touch them.
and some just outgrow corals, covering them and shielding them from light, until they shrivel up and disappear.

as for corals eating fish, a sick/dead fish maybe. these rhizotrochus typus are the closest thing to an anemone IMO, but they are better because they have a calcium based skeleton and cannot wander!
they have the tools to devour a small fish. you can see by the zoas in the background the sheer size of them-
Lol it looks like it's smiling at you with it's pearly whites
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Old 09-24-2011, 03:02 PM   #34
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I had one a few years back,they do try to catch fish but didn't have any success in mine,one thing to remember make sure your bottom live rocks are laid on the tank bottom and not on the sand,they burrow under rocks and will cause a rock fall as they are quite big,mine used to take fish from my hand but it died when it had trouble shedding.
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Old 09-24-2011, 03:32 PM   #35
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I agree with ccCapt,I have had two lobsters in two different tanks over the years.A waste of money.I usually had to use a red lenses flashlight at night to even see them.
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Old 09-24-2011, 04:20 PM   #36
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I have one that I`ve had for 8 yrs now. Maybe seen it 7 times in 8 yrs. I got this pic of him at night time one night.

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Old 09-24-2011, 04:24 PM   #37
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what is the general rule of thumb for how much the average coral can expand

i want to know so i can decide how do build my reef
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Old 09-24-2011, 04:31 PM   #38
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coral will just keep growing not really a max size
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Old 09-24-2011, 04:47 PM   #39
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i mean when they expand
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Old 09-24-2011, 04:51 PM   #40
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It depends on the coral but some LPS can extend FAR beyond their base and sting other coral.
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