Can any one help me?

Can you give more details what you're looking for? What do you want to put in it? Want s section for a refugium?

If it were me, I'd just buy a 20g and put some baffles in it. Much cheaper.
 
Wouldn't water changes be more efficient/manageable with a 20g display. A sump should be large enough to hold your ancillary equipment so that dictates a minimal size I imagine. I'm a lurker so maybe I'm missing something. My apologies if so!
 
The bigger the sump the better. I have a 90g with a 55g sump. I built the stand so I could squeeze the largest sump possible.

More water volume = better stability.
 
Wouldn't water changes be more efficient/manageable with a 20g display. A sump should be large enough to hold your ancillary equipment so that dictates a minimal size I imagine. I'm a lurker so maybe I'm missing something. My apologies if so!

A sump is certainly not an absolute necessity..
One could easily run a 20G tank (or any size for that matter) without one..
 
I would like a refugium yes, and a 20 gal sump for a 20 gal DT?

Plenty of choices here..
https://www.bulkreefsupply.com/sumps-tanks-refugiums/sumps.html

We can't make that choice for you and so far you have only provided very limited information..
You have only mentioned wanting a refugium (which you also don't need)

As stated a sump is beneficial in that you can increase water volume to help reduce the potential for swings in water parameters due to smaller changes..
Its also a place to "hide" the equipment you plan on running..
It can also add complexity to a build and may be more than some want to do..

I have run tanks with and without and personally I wouldn't do a sump for a 20g tank.. My last tank was a 40g breeder reef tank and it was nothing more than a powerhead and a heater in the winter.. It had plenty of live rock and a sand bed and relied solely on water changes to keep the water parameters stable/clean..

remember.. no one needs a skimmer or any gfo/chaeto/carbon/biopellet/purigen,etc... reactors or refugiums to have a successful tank..
But some of that can certainly main maintaining a tank easier and may allow longer time between water changes..
 
Yup. 10 gallon here. No sump, no fuge, no equipment except a sponge filter, power head, and heater. Keep up with params and water changes and it’s perfectly fine.
 
Hob filter with some filter floss heater and rock and sand in my 10 doing good just got a hydor 240 to put also but I am new do about 3 or 4 gallon water change weekly
 
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