Goldfish Poop A Lot, Siphoning Every Two Days

[ptsteve97]

[Problem]
I have two small Goldfish.
They tend to poop a LOT, and every two days I always clean by siphoning.
Should I keep it that way, or left it be?
I also have Fluval C2 but it didn't suck the poop in. Should I add another filter? I'm interested in sponge filter.
I already bought x2 Anubias Barteri var Barteri, x2 Anubias Glabra, x1 Anubias Nana Golden and approx x35 Salvinia Auriculata.

[Tank Equipment]
Fluval C2
15+ Gallon Tank (Planning on buying a larger tank)
Three Driftwood with Anubias Nana.
White Sand
LED Lamp

 

[JuiceBox52]

Goldfish poop a lot. That's just a fact. A filter wont do a whole lot, but a bigger tank will. They'll still poop a ton but in a bigger tank it wont need cleaned every two days

 

[Salty&Onion]

You need to buy 60 gallon tank for just the two of them. They get huge, and pooping a lot for them is perfectly normal.

 

[ptsteve97]

I see, thank you for the information.