Reddit mentions of Premium Pack Freshwater Master Test Kit 800-Test Freshwater Aquarium Water master Test Kit

It looks like Lowe’s has the best deal on tubs right now compared to Wal-Mart or Amazon.

https://www.lowes.com/pd/Centrex-Rugged-Tote-50-Gallon-200-Quart-Gray-Tote-with-Standard-Snap-Lid/1000237841

Here’s a good sunsun option.
https://www.amazon.com/Sunsun-HW-3000-5-Stage-External-Canister/dp/B07BG9GBM2/ref=mp_s_a_1_4?keywords=sunsun+canister+filter&qid=1567445169&s=gateway&sprefix=sunsun+can&sr=8-4

Here’s the test kit.
https://www.amazon.com/🏆Premium-Freshwater-Master-800-Test-Aquarium/dp/B07TCL1WKZ/ref=mp_s_a_1_3?keywords=api+master+test+kit&qid=1567445259&s=gateway&sprefix=API+mast&sr=8-3

Unfortunately, I can’t recommend specific sponge filter sizes because I’ve never used them as a primary filter source, but I’m sure one of the mods can help you. :)

https://www.amazon.com/🏆Premium-Freshwater-Master-800-Test-Aquarium/dp/B07TCL1WKZ/ref=sr_1_4?crid=SB7FLDKZ55MV&keywords=api+freshwater+master+test+kit&qid=1563977869&s=gateway&sprefix=api+%2Caps%2C179&sr=8-4

$22 here. It's usually <$40. It's a must have if you want to do your water changes based on science instead of guessing.

The strips are useless. Get a liquid test kit by API.
https://www.amazon.com/%F0%9F%8F%86Premium-Freshwater-Master-800-Test-Aquarium/dp/B07TCL1WKZ/ref=sr_1_4?keywords=api&pd_rd_r=09a81e7b-5edf-4bc5-925c-737f603ca62d&pd_rd_w=YScUy&pd_rd_wg=49evo&pf_rd_p=8ae6d416-c697-4484-b867-2340ed2c18c0&pf_rd_r=G03F5EM47T4D9FJEHPWE&qid=1568052940&s=pet-supplies&sr=1-4
worth every cent imo. Light seems ok, perhaps it's carbon or other parameters that you can test when you get a liquid test kit.

I see from your post history that you appear relatively new/are inexperienced in the hobby.

Please ensure you fully research everything to do with the fish you want to keep.

Invest in a proper test kit such as API Freshwater Master Kit. US/UK

A quarantine tank for all new fish.

How to cycle an aquarium.

Post as much information as you can get, including tank parameters, tank mates, tank size, what equipment you are using, age of fish etc to enable us to help you with your query.

Read the Wiki for this sub, it contains a lot of great information for the start of your journey into this hobby and also check out the Rules to ensure your post stays up and you can get an answer for your question.