Keeping them singularly a tank between 30 and 55g are appropriate, just with smaller tanks you're going to want to be aware that your water changes are frequent, but DO NOT over vacuum your substrate. I'm a sand fanatic, especially if you have an interest in corals, inverts or CUC I would definitely go with aragonite or oolite. Live rocks offer great filtration and usually have some beneficial hitchhikers. Although, whoever told you that you shouldn't use a filter and just use a protein skimmer is nuts. I wouldn't use activated carbon, though, unless you're removing medicine or something like that (can cause substrate hardening and nitrate and phosphate issues) I strongly recommend a biofloss filter, preferably with live nitrifying bacteria, and definitely use ro
water, or the cheaper alternative, Walmart sells DISTILLED water for 88 cents a gallon, although I have honestly found that buying purified pacific ocean water from the pet store at $11 for 5g in the end is actually cheaper in the end and it cuts water change time in half if not more because there is no need to buy an expensive ro
unit or lug a ton of water jugs on top of the hassle of mixing up marine salt, adding water conditioner, aerating, testing, adjusting
I used to think it was dumb to buy saltwater for my tanks (considering I've always had freshwater river and pond fish) until my hubby dropped a green spotted puffer on my lap. All you need with the real ocean water is to add trace elements. I run my sw
puffer tank 40g, around 30g with rock and sand an aqua clear 70g filter a whisper 40g filter (both HOB
) NO protein skimmer, though it's on my wish list, and a water circulator along with 2 air pumps (soon to be 4). Keep good circulation and filtration, keep an eye on your tank/ tanks and monitor water parameters daily- oh yea, and when topping off use distilled or ro
/ io conditioned water with NO salt to avoid going over board on salt levels. If I can help in any way pm me- I am on and off again on forums but am notified of private messages readily.