One I like and have been using for a year or so is Aquarium Handbook up to version 1.22 now and has regular updates, covers both salt and freshwater
Another one called invert pocket reference.
Check them out, both pretty handy...
TJ
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75G, 100 lbs LR, Inwatter Stingray LED's, 25 Gallon Sump, 24wt UV, hermits, Snails, pep, fire & cleaner shrimps, Blue Throat Trigger, Perc Clowns , Yellow Tang, Coral Beauty, Blue Regal tang, RBTA, Coral Banded Shrimp, Checkerboard Wrasse, Many Corals, Royal Tux Urchin
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