So, Which species would you recommend if I wanted a colorful carpet?
Depends what you mean by colorful. Jungles are most likely to give you that real bright yellow and deep black contrast, IJs can get a really beautiful burnt orange look to them, Diamonds live up to their name, and Coastals can be all kinds of shades (plus then you have all the fun crosses). With carpets you really need to look more at individuals instead of just what type. For example, here are two pics of diamond x coastals but they both look completely different.
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How many feet will it grow to?
Depends on what you end up with. An IJ will probably be the smallest at about 4-6ft. Jungles are more 5-7ft. Coastals 6-10ft and Diamonds 8-9ft.
Also how thick will they be?
Depends on how long they are. My male coastal cross is about 8ft and about as thick as my arm while I had a 6ft jungle for a while that was maybe a quarter as big around.
Is it going to be as thick and heavy as a boa?
Coastals, diamonds and the occasional jungle yes, IJs no.
Could I use something like a 75g for a carpet or would that be too big?
That would be big for a small IJ, good for a Jungle, and probably the smallest you could use for a big coastal or diamond (I use 4x2x2 minimum for my big guy).
Can anyone recommend a trusted place that sells carpets?
Im not completely sure of the rules on this forum and Ive gotten in trouble on other forums for talking about breeders in a thread so to be safe PM me about this and we can talk.