Oohps, sorry but all measurements are in centimetres.

miskairal wrote:
Last year I bought a second hand tank for freshwater fish until some
bright spark suggested sal****er. After a few months of reading I
decided to give it a go but without using the sump b/c I couldn't figure
out how it all went together. I didn't speak to the previous owner as
the fish tank was collected for me by my son. It had been used for
freshwater and then sal****er is all I know.

Now, 6 months later, I've decided I should try and use the sump. I'd
like to use part or most of it as a refugium with a dsb but I don't
think I can with the heights?

My main tank doesn't have a dsb. The bit I can't understand though is
that the tank is drilled on one side about 3cm from the top, one hole
only. This hole currently has some fittings in it but is blocked off on
the inside. The tank is 180 x 60 x 70cm but I have the water level at
63/64 cm which is about 1/2 way up the hole. I think the hole is 3cm in
diameter. There is a "shelf" of glass about 2.5cm above the water line
on the long sides. (The glass is 9mm thick.)

The sump looks like this from the side (sorry I'm not great at drawing)
http://goatdairying.com/fish/marine/sumpdiag.jpg
The 1.5cm gap under one partition has a plastic grid thing wedged in
there that tight that I can't get it out. I think it was used with
bioballs as there are 2 lids over the bigger sections that have a
rotating spray bar attached. The following pumps came with the tank
Via Aqua 3300 (says 2880l/hr and is the stongest feeling)
Chosen AT-104 (says 2000l/hr)
Another with no label that is very strong

I also have a spare 90 litre tank I used for freshwater (before the reef
bug got me). Can anyone point me in the right direction pleeease. I just
can't seem to relate what I have to all the diagrams I've seen of tanks
with sumps and I keep looking at all this equipment thinking what a
waste when not in use. How should I go about using it? Is it possible to
have a sump using the current hole in the main tank and if so, how? I do
not want to try a hang on overflow box.

Thanks for your time
miskairal