wow kudos to you for doing a marine tank lol I know how much work those tank and frankly its just a little too daunting to me to even attempt maybe some day when I have the space. I am very limited in what kinds of animals we can have in the house cuz this is not my house its my mom's and I want to respect her wishes. And maybe its just me but most marine tanks just seem way huge to me.
I am really looking forward to bringing home the guppies cuz they are such beautiful fish and it certainly something very different for me so it'll nice and challenging.
I am also thinking of getting a little Dwarf Puffer fish at some point too, I would like to try the lil green spotted puffers to is it correct they need at 20 gal tanks that what I thought I heard for their typical size in tanks?
I might start trying to look for bigger tanks like that in the summer like at yard sales I actually have gotten quite a lot of great deals at yard sales as far as fish tanks go.
Marine tanks don't have to be huge; my other marine aquarium is only a 10-gallon
. However, larger tanks are recommended for beginners and you can do much more with them.
The Dwarf Puffer would be in it's own tank, I assume? You normally can't house them with other fish as they are rather territorial and nippy (your guppies' fins would be prime targets of their biting). That being said, they're really entertaining fish to keep and have a lot of personality. They won't usually eat flakes or pellets, though, so you'd need to feed a variety of frozen and live foods. I highly recommend feeding live snails at least occasionally for any pufferfish because the hard shells keep their teeth worn down (a puffer's teeth grow constantly like a rodent's). The nice thing about Dwarf Puffers is that they're actually freshwater (most puffers in the pet trade are brackish or marine), won't destroy live plants, and can live in small tanks (even a 3-gallon might work for a single puffer).
Avoid the other puffers, especially
the Green Spotted Puffers. They're not actually true freshwater fish and need brackish water (brackish tanks are basically between freshwater and marine conditions). When they grow older, they should really be kept in a full saltwater set-up. They're also rather aggressive and shouldn't be housed with most other fish. Like the Dwarf Puffers, they require frozen and/or live foods. For a single Green Spotted Puffer, a 20-gallon might be alright (it's kinda the bare minimum), but I'd go with a 29-gallon personally.
Puffers in general can be sensitive to water parameters, so they need to be acclimated slowly and should never be introduced into a tank that isn't completely cycled.
Basically, puffers are awesome fish, but they tend to need very specific conditions and are rarely compatible with other fish species. Still, if you're really interested in them, research as much as possible and don't hesitate to ask questions