Integrated Multi-Trophic Aquaculture (IMTA) with abalone and seaweed offers promise as a climate-resilient system that may mitigate negative effects from ocean acidification, while simultaneously increasing production. This study tested new IMTA innovations for the co-culture of red abalone (Haliotis rufescens) and dulse (Devaleraea mollis) in traditional dual tanks vs. a single tank system. We built upon a previous study where a 65% recirculation rate in a dual tank system significantly buffered pH and resulted in greater abalone growth and compared it to a single tank design, with flow rates of 0.7, 1.4, and 4.0 gallons per minute. After 6 months, there were no significant differences in total length and weight of abalone in any of the treatments, though on average, abalone grown in the 0.7 GPM treatment exhibited the poorest body condition (g/mm²). Abalone were sacrificed, and their shell strength was quantified with a materials testing device that measured the force required to fracture their shell. There were no differences between the treatments, but there was a trend towards individuals in the paired design having stronger shells. The growth of dulse was positively correlated with flow, where low-flow tanks grew significantly less. Given the lack of significant differences between the dual tank and the single tank designs in the medium and high flow tanks, single tank systems may offer a viable cost-savings by removing pumps, significantly reducing maintenance needs and labor, and by doubling abalone production in the same footprint.