12-18-2006, 12:50 AM
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Hi, and welcome!!!
Let me start by warning you about your arrow crab. As it gets bigger, it will likely kill your blenny. You may want to remove the crab now, before there is a conflict. With that said, here's what you could do, considering water quality is good, maintenance is kept very regular, and feedings not too heavy....
1 clownfish (that tank is 2 small for 2 of any species of clown). If it's an ocellaris or percula clown, it will stay small enough for that tank. The others will outgrow it rather quickly. If you're thinking about an anemone, probably the only 1 I can suggest would be a bubble anemone, and I'd start it out as small as possible. It will take up quite a bit of space in your cube, but shouldn't have too much impact on water quality unless you overfeed the tank.
Horseshoe crab, no way! They get HUGE!!!!
2 Feather dusters would also be fine. (the other important note is that the arrow crab will eat feather dusters and other worms)
As for corals, that will depend on water quality, lighting, and temp. If you can post your water params including ammonia, nitrite, nitrate, pH, calcium, and salinity/specific gravity... then I can help you to choose some safe corals for your tank.
If you decide to keep the arrow crab, I'd get rid of the blenny and forget the feather dusters. Be forewarned, the arrow crabs get extremely large, and 1 of those will outgrow your tank pretty fast. The smaller the tank the easier for them to catch fish and create havoc in your tank. They are an ambush predator, and it's impossible to tell when they're big enough to start eating tankmates... it just happens. By the time you figure it out, it's too late. I'd hate to see that happen to your cube.
Let me know if you need more help.