or canister would be your choice. Keep in mind that they will become nitrate sinks if not cleaned weekly.
2. You want to use ro
water to minimize the nitrate and phosphate levels going into your system. If you can get it from your LFS
, this might lower the pressure on your home system. I currently have been running my 55 reef on distilled water from Walmart since my ro
went down...there is algae but being hyper vigilant I'm able to maintain it with skimming, refugium, and canister run media.
3. You can get away with no skimmer on smaller systems as you can easily do larger water changes to manage parameter issues.
4. Powerheads bring water movement into the system. It brings oxygen in and co2
out. You don't need to drill for powerheads, that is for bulkheads for a sump setup.
5. Clowns need 20 gallons min, a 30 would be just fine for a pair.
6. The only other sand bed that I'm familiar with in SW
would be people using pool filter sand in their tanks. You won't see much of any buffering from sand or crushed coral in SW
as the ph literally isn't able to drop low enough to do such a thing.
7. Thanks for reminding me how awesome I am.