If it has been long enough then the parasites probably aren't alive any more if any were left. They need a host to survive and they have a relativly short life span. But to be on the safe side you can clean it out with a bleach solution. I usually use about a ten to 20% bleach solution when I deep clean my tanks. If you want to go the extra step you could use ammonia. That stuff kills everything and is the only way to get rid of coccidia. Oh, but don't mix the two you'll get a deadly gas from the reaction. Good luck, hope this helps!
-----
Emily
1.2 SHTCT (Gus, Baby & Gizmo)
.1 Tangerine (Ziggy)
1.1 Patternless (Zander & Daisy)
.3 Hypo High Yellow (Zoe, Dini, & Munch)
1. Normal (Nelson)
.1 ???? (Unnamed)
1.1 ferrets (Oliver and Delilah)
1. budgie (Max)
0.0.1 Ring neck Parakeet (Kiwi)
1.1 German Shepards (Jake and Abigail)
The Spotted Gecko
**Updated 01-07-05**