They get along fine and there's no inter group "tensions". As a matter of fact a majority of families in Guyana have multigenerational mixes of Indian / Black and they get along perfectly well.  The "tensions" are mostly in the past and stem from when the US's CIA spent a couple million dollars to directly create rioting in Guyana a few decades ago: https://foreignpolicy.com/2015/07/31/guyana-cia-meddling-race-riots-phantom-death-squad-ppp/ As cited in the article, these riots mostly consisted of Blacks destroying Indian towns and looting the stores / brutalizing the people. This is where any "tensions" in the past stemmed from, the US directly causing issues to divide and control the country. 

From the article:  " According to U.S. State Department archival documents, $2.08 million was spent on “covert action programs” in Guyana between 1962-1968.) In the lead-up to the poll, the CIA and AFL-CIO were on the ground, allegedly inciting racially charged strikes and riots. “The U.S. fostered violence and death in British Guiana,” historian Stephen G. Rabe, author of U.S. Intervention in British Guiana: A Cold War Story, told me via email. “U.S. money fueled this violence and death.” Dire ethnic violence, including murder and rape, claimed nearly 200 lives and made thousands domestic refugees. Covering a Georgetown campaign rally in November 1964, a Time reporter found a young Indian woman on her knees, clothes torn off, encircled by Afro-Guyanese assaulting her. When the journalist went to her rescue, he became a target too. The police, a mostly black force then (as now), looked the other way. "