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What fish coral invertebrates etc. can you keep in a 2 gallon pico tank and how do you set this kind of tank up?

None at all really. To keep the tank stable you would need at least 6 gallons, and that is pushing it. A Metal Halide lamp would be too intense for such a small tank, so that limits you to mushrooms and soft corals such as acropora. I would suggest using 1x 24w T5 14000k White Marine light with 1x24w Blue Actnic. Keep 2x Turbo snails, 2x Cerith snails and one or two inverts such as red leg hermits or one or two mysis shrimp. _____________________________________________________________ While I do not mean to be overly harsh, the answer above is somewhat inaccurate, in many places. I will try to address the inaccuracies in a manner that answers the original question. It is indeed possible to keep a 3 gallon 'reef' tank. It can in fact be fairly easy if you are dedicated to following a relatively intensive maintenance schedule. Remember though that when dealing with Reef tanks, it is best to go bigger- in general, the more water there is in the system, the more flexible the system is in terms of ability to absorb and break down organic waste and then neutralize the resulting byproducts, such as Ammonia, Nitrite, and Nitrate. A smaller system will have much less flexibility and will be unable to handle a large bio-load- too much organic waste will overwhelm the system. It is therefore especially important with such small systems to have active filtration and to move the entire volume of the tank (in this case 3 gallons) through your filtration 10 or more times an hour. It is also vital to perform regular water changes on a bi-weekly or even weekly basis. Luckily, the size of the tank makes water changes somewhat less difficult than they might otherwise be! The above answer to your question mentioned an inability to keep MH lighting as a limiting factor in small aquariums- this is really not the case, as it is usually not difficult to keep a number of soft corals, inverts, and LPS under compact fluorescent lighting. You will be unable to keep clams or SPS corals in such a small tank anyway, so the intense lighting provided by MH lighting systems would be quite unnecessary and would quite literally boil your tank. Your coral selection is limited in this case by your tank size. To maintain your soft corals, fish, and LPS, I would recommend also going with a small T-5 fixture with two lamps, one at 10K or above and one actinic. Try to aim for about 30 Watts, but as is generally the case with Reef tanks, the more light, the merrier! That holds true of course only so long as you can maintain the proper temperature. As stated in the above answer, you will be limited to keeping soft corals and perhaps a small piece or two of LPS. Be careful though- the previous answer also listed Acropora as an LPS or soft coral, while I believe almost every species of Acropora is actually classified as a 'hard' or SPS coral and as such would not be suitable for such a small tank. Here are a few corals that could work in such a small system: Zoanthids, Mushrooms, Ricordea, Palythoa, any kind of button polyp, clove polyps, star polyps, Xenia, Yellow polyps, Featherdusters, and one or two small LPS frags of something like a Frogspawn or a Hammer coral As far as fish and inverts go, you have several options even with such a small tank. You cannot keep more than one fish in this tank. Period. Even keeping one is borderline, depending on its size. Remember, responsible animal husbandry comes first- your desire to keep a fish comes second. That being said, it would be possible to keep a Nano Trimma or Neon Goby in a 3 gal tank as long as it is covered. As far as inverts go, you're pretty limited. A small cleaner or fire shrimp might be possible for a short time, but they will outgrow the tank quite quickly, so I would recommend against it. I would instead recommend one or two types of cool little crabs, like a Pom-Pom, Anemone, or Porcelain Crab. It might also be possible to keep a Sexy Shrimp or two. Insofar as cleanup crews go, please completely disregard the suggestions made by whoever answered the question previously. Turbo snails do not belong in a tank smaller than 25+ gallons, as they both physically travel and grow quickly. I would suggest instead no more than two small blue-legged hermits, (or one blue leg and one scarlet leg) three Nerite snails, and three or four Nassarius snails for filtering the bottom. Now remember, with small tanks, overfeeding can be deadly. Roughly 75% of the time customers come into my store with water quality problems, it is related to organic waste from overfeeding. If you are going to keep corals that are filterfeeders, you will need to supplement your tank with some form of Phytoplankton. Also, remember that just because you'll have no SPS does not mean you can simply forget about Alkalinity and Hardness, as these are necessary components of any good water conditions for a reef tank. I suggest using the Kent two-part dosing system every other day or so to keep Alkalinity, Hardness, and trace minerals at bay. So, to sum up, for a three gallon reef tank, you will need to over-filter your water, perform a rigorous maintenance routine, and keep your water parameters at the same level you would with a 55, 155, or 55,000 gallon tank: pH: 8.1-8.3 Temperature: 76-81 degrees Fahrenheit Salinity: 1.023-1.026 Specific Gravity Nitrates: As close to zero as possible Nitrites: Must be at or extremely close to zero Ammonia: Must literally be zero. Cannot accumulate faster than it can be nitrified. Alkalinity: 7-10 dKH Calcium: 380-450 ppm