I wasn't really refering to your tap water when I mentioned water quality but it brings up another good point. You'll need to invest in an RO
unit for purifying your water and removing all the stuff that is BAD for your tank. Tap water has lots of things that you don't want in your tank, things like phosphates and silicates that will allow algae to get out of hand in your tank and cause an uphill battle trying to keep your tank looking pretty. Again, if you want minimal hassle with cleaning, RO
unit is a must!!
When I first mentioned water quality, I was refering to your specific gravity, nitrogen levels, pH, temperature and DOC
levels in the tank. I was assuming that the fresh water added to the salt mix is already purified. These are the values you need to constantly monitor with a nano tank.
As water evaporates, it will quickly cause a swing in your SG
because salt doesn't evaporate and the amount of salt is increased in lessened volume of water.
Pentagon and hexagon tanks aren't recommended either for SW
tanks. They are tall and have limited surface area for gas exchange per volume of water. Same with tall and skinny tanks, they have limited surface area too. The best are standard tanks that aren't too deep with respect to their other 2 dimensions.
I would do a search on the following subjects and read as much as you can before buying anything and starting up. The only thing that happens fast in this hobby is disasters. I strongly recommend arming yourself with as much info as possible before jumping in. It's an awesome hobby, but knowledge is key.
- nitrogen cycle
- protein skimmers
- Live Rock
- recommended lighting
- Quarantine tank
That should get you started!
I hope you don't get discouraged by anything I said, but I feel its important to pass on this type of info BEFORE you spend your money and end up frustrated trying to keep things alive and possibly feeling like you bought the wrong equipment.
Cheers, and feel free to keep asking questions....that's what everyone is here for.