Reddit reviews SunSun Hw302 265GPH Pro Canister Filter Kit

You can get a SunSun for 50$ USD off amazon.com https://www.amazon.com/SunSun-Hw302-264GPH-Canister-Filter/dp/B00MGX7JXA/ref=sr_1_2?ie=UTF8&qid=1468735993&sr=8-2&keywords=sunsun probably the cheapest and most cost efficient in the 50$ range I don't know of anymore filters that are cheaper and good for a 20 long.

The SunSun canister filters on Amazon are affordable, powerful, and quiet; best canister filter you can get for the money IMO. I have the 302 since it was the cheapest, but there are other models, some with UV sterilizers.

Here is the mobile version of your link

We all start out somewhere and good on you for learning and taking steps to improve it! :)

I think /u/SweetMamaKaty covered most of your bases when it comes to tank size and everything but you may want to check out Solid Gold on youtube for other guides and maybe it will spark a question you haven't thought of.

Two things when you're setting up your new tank though: avoid gravel and think about getting a canister filter. So first, gravel is kind of sucky for a few reasons that I'm sure you've noticed like their poo and food settling down in there and being awkward to clean and secondly, because they can try to eat it and choke. I'm still not sure how common the second issue is but a nice sand bottom of bare bottom is so much easier to clean. Secondly, canister filters are amazing. I personally bought a SunSun and love it. Its a bit pricier than a hang on the back filter but I felt it was worth it when I upgraded and the Sunsun is a good budget canister filter.

Its also a bit harder to guess goldfish's age simply because they could be a bit stunted and what not. If you've had them for almost a year, they're probably not the size they're supposed to be (really no judgement. its a common mistake and I don't think anyone here will fault you for it). But they look like two commons to me but I deal with mostly fancies and not too up and up on the single tails. They're really cute and lucky to have someone who cares enough to do their research :)

Don't know if you got equipment yet but I started with a 55 hex. I only switched to rectangular 55 because the other half found a great deal for us.
I use a fluvial e series heater they are much cheaper on amazon then what the retail stores sell them at. I believe 200 watt is what I use for 55 gallons. I use this filter it is completely silent http://www.amazon.com/SunSun-Hw302-264GPH-Canister-Filter/dp/B00MGX7JXA/ref=sr_1_2?ie=UTF8&qid=1457790868&sr=8-2&keywords=sunsun+canister+filter I just used the stuff that came with it. I switch out the carbon once a month and one filter pad once a month. I also get rid of gunk if there is any in there.
Chromies school and stay towards the top of the tank, trying to have levels in my hex is why I have those fish. They are fun to watch.

I've had a Sunsun (this one) on one of my tanks for almost two years now and have never had any issues with it.

This canister filter is discontinued. For this reason I cannot find a price on it. To be honest i would buy a new canister filter for the 15 dollars extra. People here recommend sunsun usually. This one comes with its own media http://www.amazon.com/SunSun-Hw302-264GPH-Canister-Filter/product-reviews/B00MGX7JXA/ref=cm_cr_dp_qt_hist_one?ie=UTF8&filterByStar=one_star&showViewpoints=0
but watch a video on how to set it up. Directions are bad

Ok thank you so something like this filter would do the job? http://www.amazon.com/gp/product/B00MGX7JXA/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944687742&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B00892EN22&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=088S0GBKCWZBZKASD7T0

Here's the exact one I have on my 20 gallon: https://www.amazon.com/gp/product/B00MGX7JXA/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
I have an aquarium chiller connected to it as well.

You could always go for something like this. I am running this alongside my 2 2215s. Works just fine. No leaks. If you are on a budget but need an ok canister I would recommend the sunsuns.

I have the 60: https://www.amazon.com/AZOO-AZ13097-Mignon-Filter-60/dp/B005VEWCMO

The 150 is also good.

The only reason I went with the 60 is because it's very small, and there is little bioload in the tank it's on.

Sunsun makes smaller rated canisters but they are still bigger than a HOB. This is a small one https://www.amazon.com/TechnToy-HW-603B-3-Stage-External-Canister/dp/B00CC6SCJQ or https://www.amazon.com/SunSun-Hw302-264GPH-Canister-Filter/dp/B00MGX7JXA/ref=sr_1_1?s=pet-supplies&ie=UTF8&qid=1469731069&sr=1-1&keywords=sunsun+canister+filter

Also like snowmunkey said, aquaclear HOB are also an excellent choice.