I know I only want 2 or 3 archer fish. Ā I have a 65 gallon tank. Ā I plan on filling it to 50-ish gallons to leave some room for jumping/spitting. Ā I know how to get the SG to where I want it. Ā But my LFS said something about "needing" crushed coral at the bottom for buffering or something. Ā Do I "need" a substrate? Ā What other water parameters do I need to be worried about with archers? Ā More questions to come, but my little one just started crying..... can't ever get anything done, lol.