These are great, too! About $9 on Amazon and at a 10" diameter they fit nicely under a 5-gallon fabric pot which can then sit inside a 12" water dish to catch runoff so your plant isn’t sitting in a puddle and your grow tent stays tidy:
https://www.amazon.com/gp/product/B00JINPK2S/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&th=1
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