01-12-2011, 07:29 PM
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Your more immediate poroblem is getting rid of some of what you have, not adding more, unless a very large tank is planned soon. A 33g is much too small for fish that get as large (if healthy) as Kissing Gourami, Siamese Algae Eater, Red Tailed Shark, and goldfish. And goldfish should not be kept with tropicals.
Please have a look at the fish profiles here, second tab from the left in the blue bar at the top or click on the shaded name. For each species the info includes adult size, minimum tank sizes, numbers of the fish required, and suitable tankmates.