05-02-2011, 01:22 PM
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Hi Kayt, and welcome to Tropical Fish Keeping forum. Glad to have you with us.
Now, to your question; yes, you have some stocking problems with that plan. Bloodfin Tetra are normally peaceful, but as with many characins (tetra) they can be nippy when kept with sedate fish with long fins. The Pearl Gourami would be quite a temptation. The Bloodfin scientifically is known as Aphyocharax anisitsi, and the fish in this genus (Aphyocharax) are rather feisty and prone to nipping fins. I would find another shoaling fish, or in a 55g I would have 3 or 4 shoaling fish groups.
Rasbora make excellent companions; they are colourful, peaceful and not too active. Sedate fish like gourami do not appreciate boisterous fish around them, it un-nerves them. Any of the medium/larger species [avoid the dwarfs, they will be eaten]. We have fish profiles here, second tab from the left in the blue bar across the top of the page, or when a name is shaded in posts you can click on it to see that fish's profile. Rasbora are in the Cyprinids group in the profiles, and there are several suitable species.
The other possible issue is the Red Tailed Shark, but you seem to know that anyway, and I agree that under these circumstances just wait it out. But I would not anger him with other substrate fish, he will rule the substrate and that may be the extent of his aggression as he matures. You can read more in the profile.
Floating plants are also very suitable with gourami, and rasbora like them too. Some suggestions are in the plant section of the profiles.