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Anyone know when its best to change RO/DI filters. A TDS reading of 0 ppm of course is the ideal measure, but is it necessary to spend the money to buy filters if the reading is 10 ppm, 50 ppm, 100 ppm? Where is the cut-off? Thanks!

I have had a porcupine puffer for about 7 months now and I recently added a feather duster. I had wanted something new for my tank and I figured a feather duster was just the right addition. I have hermit crabs, an emerald crab, polyps...none of which my puffer had taken any interest in. My...

can anyone please tell me what this thing is...one day I was cleaning the glass and bumped my live rock and the highlighted...creature?...retracted into the live rock about 1/2 inch. It doesnt look like any sort of animal but it most certainly is alive because it responds to physical senses.

I just found this thing on my goby....it is stuck to his lower fin and it seems like some sort of external parasite. Anyone know what it is??????? I need to know right away if its harmful to him....and anyone know of a good way to remove it????? HELP!!!

Anyone know if a porcupine puffer and a harlequin tusk would be compatible together? Anyone have experience keeping both?

I just bought a refractometer along with 53 mS fluid. However, what does the 53 mS equal as ppt and sg? Thanks!

I need some help with some new "things" that took a ride on my new live rock.... Scallop????? Have no idea what this is...polyp????

I have about a 2inch sand bed in my 55 gallon and I would like to increase its volume. Will adding more live sand cause my tank to cycle again?

Can any help me with an ID of the following polyps? Also, the "brown" ones of the left...are they dying? dead? fine?

My LFS has flounders and they are very cool fish. I would like to purchase one if they are compatible with my tank. Has anyone ever tried to keep a flounder? Are they difficult to keep in a home aquarium? Are they prone to diseases? What do they eat? Compatibility?

Yesterday I am sitting in front of my tank (luckily!!) and I hear water spilling out of my tank ! I have a hang-on cpr protein skimmer and it was overflowing! I quickly shut it down to investigate the issue. It just so happens that one of my turbos crawled up into the outlet pipe and blocked...

Anyone know of modifications that can be done to a CPR dual pak protein skimmer?

I have a couple of concerns about the porcupine puffer I have had in my tank for about 4 months ("puff" stuck as his name). My biggest concern is that he is very very lazy....he lounges on the sand in the corner of my tank for 85% of the day. The 15% referring to feeding and rare curiousity. He...

I would like to hear some honest opinions on my newly established saltwater tank (6 months). It is the first time that I set up a saltwater tank and honestly its such a blast! I am new to the hobby and do not know much about coral, so if someone could evaluate the health of my polyp I would...