50 gallon aquarium filtration?
I just got a 50 gallon aquarium for free and I'm not sure what to use for filtration. It will be housing 4 Figure eight puffer fish.
I would return with a simple "hang on back filter" with a bio-wheel i.e. good for up to a 75gallon.
Also, 4 figure 8's may not be a great idea. They don't typically do powerfully with any tank-mates. They are best kept alone.
I prefer eheim classic filters.
Canisters run quiet, hold 4 times the filter medium capacity of hang on's and every tank is different but verbs out my canister filters every 3 months.
Talk about low maintenance versus a suspend on.
Make sure you have solved your snail issue if your getting brackish puffers.
They requirement a steady diet of snails to file down the teeth or they usually die in a year.
You will either have to make a snail penal complex or have made an agreement with a pet store to supply you with them (usually free).
Nothing can pounding a canister filter for performance, They more expensive intially but in the long far cheaper than a hang on due to cost of monthly medium replacemments.
Its best return with a larger filter than a smaller one, because fish will grows up. I would say its best to get a easy to function hang back filter like the aquaclear 110. Its rate for up to 110 gallons. I wouldn't recommend getting any smaller. They say you need to go double your fish container volume. If you have a 20 gallon, you will need something rated for 40 gallons.