questions for all the brainy types!

I bought a used tank setup for my little store. Heres the scoop. It is 3 - 21G (36x12x12) tanks set up vertically on a steel rack, with a 22g sump at the bottom. So each tank is directly above the last, with the rim of the top tank at 6 feet. Each drain is 1", but opens into a common 1.5" drain to the sump. There is a single 3/4" return line, that reduces down to 1/2" loc-line that just hangs over the rim of each tank.

What the hell do I need for a return pump? How much GPH? And I'm assuming the top tank would have less return pressure than the bottom due to head pressure, but I can adjust that with the ball valves

So anyways, another question. The sump is an acrylic E.T.S.S. protean 400? Its nice looking, and has a built in skimmer. Anyone know anything about this? The pump for the skimmer is not included, but it recommends a mag 7. I'm going to use my quietone 2200 as I'm assuming its not enough for return.

 

Can you post a pic of the setup?

Sounds like it would be an awesome frag system. :bounce:

A 1" line will drain MAX 600gph. If you have 3 drain lines (1 from each 21g tank) at 1" each, then you can POTENTIALLY drain a max of 1800gph into the sump. But that doesn't necessarily mean you want to move that much water. You could slow it way down and only move 300gph if you wanted too. The 1800gph is only the MAX your system can do.

I'm going to cheat and make the math easy by saying each 36x12x12 tank is only 20g.

With each of the 3 tank at 20g - let's say you wanted 20x turnover. You need 400GPH for each tank. x3 and you need a 1200gph pump. That doesn't mean it needs to pump 1200gph at 6 feet of head. It only needs to pump 400gph at 6 feet of head because you only have one tank that high. If it'll do 400gph at 6 feet and 800gph at 4 feet and 1200gph at 2 feet ....... that pump will do the job.

Of course you can adjust those numbers if you only want 10x turnover in the tank. And use plenty of ball valves to adjust flow.

Don't worry about pumping the tanks full of water and causing a flood. As long as you remember each 1" drain line can do 600gph and don't put more water IN the tank, then you will not experience a flood.

I think............ :shock:

 

Bob could you re-do the plumbing so that you are only pumping water from the sump to the top tank and use overflows and gravity to have the water get to the second and third tanks? It would cut down on the flow in them but thats nothing a cheap powerhead couldnt handle and to me it sounds like a more simple set up. Just an option I thought that I would throw out.

 

Did you just openly suggest a powerhead in the tank for water circulation?

Somebody get a rope!!!

j/k :mrgreen: I think powerheads in the tank are ugly. My next tank will be drilled with a closed loop for circulation. You won't see anything but one or two 1" drain lines at the water surface.

 

RC have you had a closed loop yet? I will NEVER have a tank with one again, they are ineffecient and my isnt sufficient enough for sps. Powerheads are the only way to go IMO/IME.

 

Im with ryang. i really strongly dislike my closed loop setup

 

I'm also with Ryan on this one. nothing can compare to the actual source of water flow being in the tank. Yes its more ugly but well worth it...and one might say that the ugliness of a healthy system is actually not ugly at all but part of its overall beauty

 

i dont think a powerhead being in the tank is really a concern here since this will be used to house corals until they sell

 

Really?

Are you guys using underpowered pumps for your closed loop systems?

I read a LOT on different websites and I came to the conclusion that the closed loop was the shizzle when it comes to water circulation........

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:shock:

 

In theory they are the bees knees but in function they come up lacking unless you have a lot of room a lot of pumps and a lot of money! My pump is probably a little undersized but not by a lot. I could use to go up one size, but even at its rating we are talking 20x turnover in my system. I can do that with two K4s, I could get it up to 40x turnover with four K4s and still have it come in less that the "upgraded pump" that would get me to 30x rate. Then you have the noise factor, extrenal pumps are LOUD all of them have a hum of some sort, mine is more like a mild roar! If you have a basement that you can keep a couple of pumps in and dont mind your electricity bill being $20-30 higher than closed loops can be made effective. But if you want to get truly random flow plan on getting a Oceans Motion for each pump and that will crank up your cost another 200+ for each pump. They all have their pros and cons looks are the only downfall that I can think of with powerheads.

RC I absolutley HATE the look of powerheads BUT I think I hate the ineffectiveness of my closed loop more. I know that my next tank wont have a closed loop too much of a PITA for me.