35L is only about roughly 10gallons... sorry but you can have 5 pygmy (dwarf) puffers in that tank... 2 tops...
Read the pinned article in the oddball section before getting 5 into that tank... First it's barley planted enough for 2 as dwarf puffers are very intellegenet and enjoy interacting with plants... They are also extremly agressive towards eachother... 5gallons per dwarf puffer in the minimum tank space requirements, and don't put anything else in there with it except BN plecos and otto cats... read the pinned article as I said and you'll understand why... nice looking set up though, just not for 5 dwarf puffers...