- I'm not sure how much research you've already done but here are some key areas to look into before taking the plunge :
- Water movement (ie. powerheads and lots of 'em !! )
- Heaters (get good quality heaters right from the start, eg. EBO-JAGER and it's better to have 2 instead of just one for redundancy)
- Food (feeding small amounts of high quality food is important - no flakes if possible)
- Test kits (you need to test for various water chems such as Ammonia, Nitrite, Nitrate, PH
, Specific Gravity, and possibly Calcium, Magnesium and ALK
if you intend to have a reef tank (ie. some corals))
- Lighting (only important if keeping any corals or if you want good coralline growth on LR
in a FOWLR
- Salt (a lot of people have a lot of differing opinions on what salts are good so do some reading and make up your own mind. It's useful to start with a good salt as switching later is a bit of a pain)
- Water (Not a simple as turning on the tap unfortunately. Do some reading about RO
water. If you can start with that right from the first fill you will have less problems down the road)
- Safety (be sure to connect all electrical equipment through GFCI outlets so you don't get electrocuted !)
Finally - if a lot of the terms above are confusing try moving your mouse pointer over the ones highlighted in red - it will give you a little popup with the full term.
Finally Finally - get a copy of "The Conscientious Marine Aquarist" by Bob Fenner and read it cover to cover before setting up
Good luck !