I second the sand substrate, especially for a dragon goby. Use pool filter sand. It's rounded and uniformly sized - rather large for "sand", and vacuumable during water changes using a slow flow siphon gravel cleaner.
MTS are your friendin keeping the sand bed from being packed down, and, for my tank anyway, I like the substrate to have a "natural feel". a bit of detrius is attractive to me.
I run an overtheback calfo style overflow to a sump with filter bags over a large bioball reservoir, and also run the biggest eheim canister (2260? It's basically a modded 5 gal bucket).
MTS are your friendin keeping the sand bed from being packed down, and, for my tank anyway, I like the substrate to have a "natural feel". a bit of detrius is attractive to me.
I run an overtheback calfo style overflow to a sump with filter bags over a large bioball reservoir, and also run the biggest eheim canister (2260? It's basically a modded 5 gal bucket).