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Wow, if you put a rock 12"x 4" x 4" and it weighs 5lbs and a rock the same size but weighs 10lbs what one displaces more water?? there both the same! it is the area/volume they take up(displacement) 12"x4"x4"=192 cubic inches 1gallon water= 231 cubic inches-densitity of saltwater/sg is a weight...

It is how much space the rock takes up-it is a volume thing weight/density has little/or nothing to do with it-figure out many cubic inches of rock you have and knowing that there is 231 cubic inches of water in gallon that is your displacement-not looking to argue just answering a question...

Bad, looks like it is a gorilla crab-pretty much will eat any-everybody! the blacktip pinchers and hairybody are enough to id it -get it out while you can!

There is 231 cubic inches in a gallon of water-so figure out your cubic inches of rock and that should be your displacment value, porositity of rock has some effect but your looking at space /volume

Oh yes, that clam may cause a divorce-mine! add to cart! add to cart!

Yeah, having your mg 1300+ will inhibit/stop algae growth-I had a hair algae problem for years until I started paying attention to my mg level-raised to 1400 for a month algae died off quickly! I now keep at 1300 with Ca @420/450 need to keep in proper ratio! Must/all syn salt mixes will not mix...

A plus for kalkwasser-calcium hydroxide-is that it binds" phosphate

The poor bristle worm gets the bad rap again!! no they do not eat clams lab boy-detrivores/carrion- I would suspect a water quality issue first- need more info on water params species of clam you said giant T gigus?? all clams are light demanding some species more so T. crocea the most/gigus the...

Northstar nailed it- your tap water is feeding the cyano- before I got our R/O unit I would use water from the glacier water machines located outside the supermarkets R/O D/I units only 30cents a gal- red slime remover is only a bandaid and will hurt your bio base.

It,s not the depth of the sand bed, its the particulate size a 1" deep fine substrate(oolitic arag .25mm and smaller ) will support denitrification as long as no one is digging it up.The coarser the substrate the deeper the bed-

Led's are the future! I have been proving them out on my sumps/refugiums using 18w on a 30g and 27w on a 50g amazing! chaeto/mangroves/coraline/ mushroom corals-all thriving year 2. I would try to get your alk up and stabilize your ph should take care of the xenia problem-3/1 mg ca need to have...

I had the same issue when I started using a reactor with a ferric oxide/carbon media-also briaurium(star polyps) started receding with xenia-would suspect reactor media-your alk pretty low! and ca high, hows your mg levels?xenia very sensitive to ph swings-with your alk level your ph is bouncing...

Always! -scary quote but true!! the creatures we house have a couple of millions yrs of evo on us who-houses-who??- we are but a speck.

Could be some bleaching,should re-aquire zoanth and be fine -its the ability of the water to hold o2 at those temps that do the damage, the more flow/fractation u have in your tank the higher probablity the tank will survive high temps-

Derasa are the most forgiving of the giant clams vary tolerant of lighting because of wide range of depths there found at naturaly-there bysal attachment goe,s away as they mature there size and weight hold them in place-not all giant clams react to movement/light gigas/derasa noteably-my...

Oh yeah, it will not grow"a foot- it will secrete threads witch will harden and the clam will hold onto with organ-

Yeah, what species?? sort of sounds like a derasa because it has not bysally attached yet-rock boring clams- crocea/maxima bysally attach within hours in proper condtions-if it is a crocea/maxima it needs to be on hardpan surface close to the lights-derasa are the most forgiving in terms of...

Big bubbles sound like plerogyra- small bubbles could be several diff species-you need to know care and compatability before u buy!! good book R. Shimek 500+essential to know inverts-for online resources -saltwaterfish.com/marinedepot/foster&smith ect. all have pictures with care and...

Corals of closley related species can touch with no interaction or aggression-e.anchora/e.divisa(frogspawn/hammer) and many acropoids-sps-typically if there found co existing in nature there fine,corals not naturally found together will show aggression-best to build a reef with naturally...

The eupyhlia(frogspawn/torch) have super long sweeper tentacles 8"-10"+ and if they sniff a competitor will activley go after, the bubbles are the most potent stingers but have much shorter sweepers-3" so keep there reach in mind. If the frogspawn is branching(para divisa) it could double its...