Hello! Thank you in advance for any help.
I am currently running a RSR 250, so 55 gallon DT and I am running two a80 Tuna Blues (tank was purchased used and these came with it). After some reading, I’ve seen some information that suggests these lights are not sufficient (strong enough) for a 55 gallon.
Is this true? I currently have an indo torch and hammer about midway up the tank and both seem happy most of the time (will retract a couple times a day).
36"L x 20"H x 21"W
Remember that round puck style lights project a symmetric light cone.
So if you want to cover 21" right off the bat the l/r spread is 21"
Well Kessils are circular not square but that disadvantage quickly dissipates.
So no matter you really need 2.
Wattage and by extension par needs are determined by what you grow and where you want it.
Fortunately many lights are dim-able so with the right amount of power under-lighting gets more unlikely.
but things like the 2 15W Kessils you have now do not have not enough power to keep more light hungry things happy.
Par measurements below in thread.
70 PAR @ 10" was reported.
Which is what you may get around 1/2 way down in the sweat spot.
I recently had the fortune of borrowing a par meter from my local reef society and testing it out in my tank. The tank's dimensions are 24 x 10 x 10" and the par varied from 30 to 40 at a corner to 40 to 70 in the middle from bottom to top. I've read that par meters don't pick up the par from kes...
www.nano-reef.com
Of course there are a lot of "other things" including what you want to spend.
There are numerous lights that you could get and I'm not going to "recommend" any in particular BUT I will give one example as a starting point..
Everything you need for your aquarium
reefbreeders.com
$760
150-ish watts or so, lots of par ect.
Listed at 230W power consumption.
As to your used Kessils...????
Depends on age, condition, accessories, ect.
Listed at 90W each.
for what its worth..