Do you know any succesful black tip reef shakr keeper?
I still wonder the size about the tank.
There are several members of this board who have kept Blacktip Reef Sharks- such as Turbo253, and Zoodiver(Matt). Some of them have several years of experience with them.
For example Majestic Aquariums has 20.000 liter and it is too small in my opinion.
What do you think?
Yes - 20,000 liters/5,300 gallons would be too small for adult Blacktip Reefs. It may work for juveniles. But with a tank that size, you would really better off with smaller smooth hound sharks. Or possible several species of small benthic sharks and rays.
Do you know where to buy large bags of Instant Ocean and how much does it cost?
Well - Instant Ocean sea salt mix does come in 160 -200 gallons/ 600-757 liter buckets. But it is also possible order it in bulk. How much is it? While the US prices range are about $40-55 for a 200 gallon/757 liter bucket. I am uncertain as to price in Europe. But if you start buying in bulk - you will likely get a reduced price. Or Possible free shipping.
I did a calculation according your salt water recipe. And 1 m3 of water will cost about 28 USD in price of salt which is fairly good. Price can be cut down by bulk buy.
Some of the elements was farmaceuitc quality, most of them was "swimming pool" quality.
I could make a laboratory test of quality, but I don't believe it will tell me everything. Some real testing would be necessary.
Agreed - I would definitely suggest testing it in a smaller set up - before using it on such a huge shark pond.
I think I should start with some salt water aquarium. My imagination is about 60 gal tank with live rock and sand. No corals. What fish do you recommend?
A 55-65 gallon/200-250 liter aquariums is basically going to limit you to small eels, dwarf angels, dwarf lion fishes, small puffers, clownfishes, & damselfishes. By the way - the type of tank you are talking about here - is a FOWLR tank (Fish Only With Live Rock).
If it is possible - I would suggest going with a larger saltwater tank. For several reasons. 1st - is that larger tanks are easier to maintain. 2nd - The tank will be more stable (after cycling is completed). 3rd - a larger tank opens up the possibilities of the kind of fishes you can keep (if the tank is larger enough even some benthic sharks & rays).
For you first saltwater tank - if you can - I would suggest a minimum of at least a 180 gallons/680 liter tank. Which would make a good tank for some small benthic rays or sharks. After you get some saltwater experience - say 6-12 months.
I want to test soils, filtration systems etc. Thats, why is the tank so small. And get some experience of course.
Still It would be better to go with a larger tank.
For exapmle, watching the sharks from cage or snorkling with the sharks will be wery attractive event in the Europe. Downside is obvious. Sharks will be stressed. So it must be a few persons a week maximum.
What do you think?
Yes - while it may stress them for a little while - the sharks will adapt to have people diving in their tank/pond. That is how it happens in most public aquariums. Every shark aquarium in every public aquarium across that world has people who regularly dive in the tank - if for no other reason than to feed them, and clean the tank.