Bulk Reef Supply Do It Yourself netting kt, new, never used, still in delivery box $35. Retails for $55
I got it for a Red Sea Reefer 450 and was going to adjust the parts to make it about 4x3 ft. As long as you don't have a tank over 5ft long, it should work.
Well I was thinking about the 180 I'm trying to get going this weekend lol thx for the info @whippetguy
If you have cross braces on the 180 you will have to have multiple smaller screens. I have 3 on my 6' tank. You can buy the extra corners needed to make this kit work if there is enough frame material.