My animals lose my attention due to a new comer?

i have 5 pets. 3 cats, 1 dog, and 1 iguana. i was hoping to raise enough money to adopt another animal. a tortoise. i've been hoping for one for about a year now. i know if i got one, he would be like my little pal. i mean i would be with him a lot beacuse he's "portable". i could carry him places on hot days. my cats are indoor and not allowed outdoors. my dog is a big rough houser and doesn't get along too well with other dogs. only rebar, and he pes a few years ago. and i don't think the iguana likes me-well she doesn't like anyone too much, but my dad. she loves my dad. i still love all my animals very much, but will they lose my attention? any suggestions?