Had the 250 as my second tank and loved it. Definitely more space (sump and DT) than the 170, but I still outgrew it within 2 years.Worth going RSR 250 over 170 for a first tank? The RSR is obviously more expensive, mainly due to an additional LED, upgraded powerheads, more rock and sand, etc.
But the setup (tank, stand, sump) itself is comparable when comparing the prices by my local vendor. RSR 170 is $850 and I would buy a custom ATO reservoir for $165 to fit in the small stand. Total would be $1015. RSR 250 is $1110.
Another concern is moving the tank since I tend to move every 2 years so size matters but the 250 may not be too big?