Clowns are pushy by nature, and if centered in a nem can take care of themselves. Chromis function as 'dither fish', rushing madly about (only 1 per 50 gallon tank) to reassure the others there are no sharks. Alas, there is no tang that will work in a 30. You need toward a hundred gallons for the smallest: they're too big and too active. The canary blenny is good---in general, the blennies, gobies, dartfish (firefish et al) and small jawfish will do well for you, including maybe the royal gramma. Avoid angels if you want coral.
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Sk8r
Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low.
Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%.
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