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AO just got in some nice small fish again. If you get a chance check them out too. The more you see the better. Shopping is half the fun. Plus the hope is that your fish will live for years so you want to make sure you get what you really want. The oldest fish I have is about 6 years old has...
If you don't have a book on reefkeeping now would be a great time. You can read a lot of the threads in this section it will be a good place to start. For a 55 G tank you are likely going to want to make your own water, but that comes with an issue of it's own. You will want to filter the water...
I have the Ca levels in different salts somewhere but just good water changes with better salt will keep your Ca around 400. At least until your corals start pulling a lot of Ca out.
What salt are you using? Calcium seems pretty low for what you have in there.
I had a pygmy angel that would do what yours does...never caused any damage. They just tend to pick..if you see him taking some real bites then get rid of him.
Drs Foster and Smith is the way to go for sand because they ship according to $$$ spent so shipping on sand is cheap, and their prices on sand is also cheap...I would go with one bag live sand one bag dry.
I believe there is a sticky thread with different skimmers under equipment.
Building your own sump basically is getting a used 20G fishtank from someone some glass cut from homedepot and some silcone and you make your own...this is probably the cheapest way.
Small Mag 5 or 7 or a Quiet One...
Wow you picked a great time to see Will at AO IMHO, he has some great nano fish.
Jawfish, cleaner gobbies, swiss guard basslet(ok that one is pricy but very particular and very healthy), those are just a couple that I liked and didn't buy. I got a pair of sharknose cleaner gobbies and a 4 line...
I have it in my sump, have since I started. I have taken the opportinity to add a mangrove but a year after I started the tank. My refugium's cheato has always grown very well for what it is worth. IMHO it is a little luxury that wasn't needed but why not.
Pic added
I put shells in and they have gone for them.
You can also boil the dead snail and the guy will slide out.
I have tons of shells if anyone wants them, I am in Little Silver.
I would just leave as is. If it likes it there then it is happy. I tried a couple times to "accomodate" mine and it would just move. Since I left it alone it has not moved since. Not where I would consider optimum but it doesn't care so I leave it be.
Great job starting with a plan, just be flexible enough to listen to some of the good suggestions you have gotten already.
The more you lean on natural filtration the more you will need.
I would say you will need 40-60 lb of live sand, and the same in live rock.
The more you have the greater...
You lose pressure pretty quick with small pumps.
You will need to either drill or put an overflow on the tank, or you can put the sump above the tank as a display refugiumm. Your other choice is a hang on refugium.