Ok DIY ppl...I HATE my new R300 sump. It is too small for my tank so I have to run a very low water volume so it wont overflow when the power is off. I want to make one, as I want a special section to keep chocolate chip starfish in for my harlequin shrimp. I have been looking into HDPE tubs but I am reading it is really hard to bond HDPE for making baffles? Anyone done this and if so how? Should I look at other options? I found a 90 gal HDPE tub but I am afraid to jump into this!
You could go for an option such as this....
https://www.customaquariums.com/information/seamless-sumps.html
While baffles won't work each section is it's own compartment and they do have baffled sections.
Another option is a glass sump, Very easy to DIY with glass or acrylic baffles
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