question about water

is this your first tank, i dont think seahorses are for the newbies

fascinating beautiful species but sea horses wont tolerate tap water sensitive species at best of times best to get everything perfect environment, water, matured filter & if you have not already lots of research........

what is the size of the aquarium in inches length etc

It honestly depends on your tap water.

Your tank will be big enough for seahorses, but be advised they are not for beginners, and often require live food.

It does depend on your tap water but, for 95% of us it won't work. I'd also agree with the other two posters that seahorses require quite a bit of care and are very sensative to water conditions. They also need to be feed live foods several times per day in order to live. I'd honestly encourage you to start out with something easier and get some practice with keeping marine tanks stable prior to trying the ponies.

Ive had a seahorse that I have had in my tank for about 3-months before it died because it was not eating. It was wild cought and about 3" in length and all it ate was live foods. I tried to convert it over slowly to frozen foods but did not want too. They are I think a high maintence species, that constantly have to make sure that htey are eating and not the other fish eaing their food. They have to have pleanty of places from them to grab on too because they feel safer knowing that they have something to hold them selfs' expecially whey eating. You will see them wrap their tails around something and snap reaally fast to get the food. Also they do not like fast water flows in the tank and are very very slow species. ONe last thing. Before you get a seahorse ask if you can see it eat. If it eats frozen foods then you will have a lot more of a fun time keeping it in your tank than live food. Ive noticed that once my live food stoped moving the searhose just ignored it like it was not there and would not eat unless it moved. Just something to think about. And if I remember correctly one seahorse requires about 10 gallons. I could be wrong though.

Disisgustavo, I'd suggest taking some water sample of your tap water and finding out the pH, hardness, and phosphates. That should help decide whether tap water would work in your case.

For what its worth, I'm using tap water in my nano-reef.

gustavo, don't count on SF water being bad. Tap water there and for much of the Bay Area comes from Hetch Hetchy Reservoir, doesn't it? I miss my Bay Area tap water, it didn't form lime deposits like I've got now. But yeah, get it tested for nutrients. Tap water conditioners won't remove things like nitrate and phosphate which will contribute to algae and poor water quality in general. So if you find those things in your water, you will need a water purification system such as Reverse Osmosis.

Boxfish are neat. Just beware that when they die, they will release toxins into the water and possibly kill the rest of your tank inhabitants. It happened to me

seahorse will take to brine and mysis if they are young, yes they will take more care, but if you read lots of info, and perform good maintanence they will be fine.