JOINING THE BIG BOYS, The start of my 180g display 350g total vol.

Looks sweet!
Are the 5 one inch holes for your returns or a closed loop? If their for returns, your going to have a problem when your pump shuts off. If their for a closed loop, I would have made a couple of them much larger for the intakes.
 
What is the best way to start to transfer the 75g contents over to the 210g.
Do I get the new system up and running and just take some of the rock from the 75g. let that run and than acclamate the fish to the new tank. Just trying to get a head start on my plans.
 
I have a question about the tank sitting on the stand. The front right corner does not sit flush with the plywood top, it is all level but there must be a bow in the plywood. I can just barley fit a wood shim between the tank and the top of the stand, so should I put what I can under it or just leave it alone? I will post a pic soon.
 
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I recently went from a 75 to a 210 as well. I built my stand and used probably 30 shims. Probably not ideal, but it is still holding strong. I would say that if you can easily add it in there, along with a couple others, go ahead. As long as you are not making it less level.
As for transferring from the 75 to the new tank, I used 90% new water and all the rock I had in the 75, plus some newer rock that I had been curing for 2 months. I also used 90% new sand. My tank went through a short algae bloom - about 3 days where parts of the sand was lightly covered in brown diatoms. I didn't lose any fish or corals.
Let me know if you have any other questions. I just went through this at the end of December.
 
anjhof, I was going to get live rock from others breaking down to add to the 210 while the 75 was still running and than trans fer some of the rock from the 75 run them for a few days and test water. did you cycle at all? Did you acclamate the fish to the new tank?
 
It took almost a week to fill up the tank with new RO water. During that time, I added salt every day and kept track so that I could keep the salinity near 1.025 the whole time. Of course, I was just taking cups full of salt and throwing them in the tank, while I had all my pumps running to mix it up. Once it was nearly full, I added the sand. That caused the tank to get cloudy for nearly another week. While the sand was settling, I started moving my rock into the tank. The plus side, was that I was able to get the tank ready more quickly. The down side was that I had a difficult time seeing where I was putting the rock.
In hindsight, I would probably add all the rock at one time while the water was clear.
I would say the water was in the tank for almost two weeks from first day of filling the tank to adding the first fish.
I kept the salinity and temperature of the new tank the same as the old 75. I netted my fish from the 75, put them in a bucket (one at a time) and moved them into the new tank. Basically zero acclimation. I moved a powder blue tang, purple tang, flame angel, damsel, 2 clowns, and a goby. I also moved all my corals at the same time as the fish. I know a lot of people on here are ultra careful with acclimating their fish and corals, but I have had zero deaths in over 3 years with minimal acclimation. I think people over complicate things sometimes. I attribute much of my success to my very light bio-load for a 210. I only have 7 fish, and none of them are over 4-5 inches.
I would run out and buy a step ladder. My tank is on a 36" high stand and I am 6'2" and I use it every day. I can see why people get tired of dealing such a tall tank.
Good luck. Let me know if you have any more questions.
-Jeff
 
as for the the problem with the bowing i would go out and get some of the pink foam insulation and put it under the entire tank. if it is still not level then put the shims under the foam insulation..just a thought!
 
I sanded down some of the high spots on the plywood so all the corners are resting on the top of the stand. There are some spots along the front and back edge that have a small amount of space that only a pice of paper folded in half can fit in. I filled the tank with tap water to see if there would be any problems with leveling. So far so good.
 
Well I just put some fresh water in the tank to do a test run. I have only found 1 leak at the fiting that threads into the bulk head for the CL. thank god it is a small leak so I can finish the test run with fresh water.
After filling my only concern is that should I have used a center support on the back of the stand, or will the double 2x6 with a 3/4" plywood be strong enough?
Any thoughts on this I will post a pic tonight but on page one you can see what I am talking about.
 
Opinion here - It would make me nervous. I don't like not having a 2x4 or 2x6 or 4x4 under where the tank sits.
 
OR, do a secon header from front to back in the middel to support the other header. kinda in the shape of a cross. Have the post on either side of the sump, using 2x4s for this also.
 
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