Flow & oil film issue on 60g cube

[foxngn]

Hey guys,

My tank size is 24inch x 24inch x 24inch.
I'm running sump tank, a fan for cooling down and a wave maker.

I would like to ask, will a gyre type of wavemaker is gonna be overkill for a cube tank?

Another things is i had this tank running for more than 5 years. But only within a year times, the tank water surface started to develop this oil film.
I do not want to invest a surface skimmer. The only way i could eliminate the oil film is to turn down my flow rate, where the water level will be same as the overflow area. But i do not want to turn down my flow rat, i would want it to run on max.

In such case, what other resolution i could use to solve this issue?

 

[vetteguy53081]

If you don’t have an overflow which should alleviate this along with water current, add a hang on back power filter which should break it up
Even the smallest gyre may be too much for this size tank

 

[dank reefer]

Depending on the type of sand you are using, a 1-2k gyre pump will work out for you if you keep the % at below 40. When I first started my wife 60 cube I added a 3k gyre until I was able to get my MP10's. Yes it did kick the sand around a bit, but it wasn't too crazy. Sand in tank is Caribsea black sand which is pretty coarse. If you are using fine sand in the tank, then do not use a gyre as it will look like a sand storm was unleased.

Here is the Wife's tank with 3 MP10's and a 4th one on its way.

 

[foxngn]

I don't have an overflow box, my tank is those traditional left n right overflow to sump kind.
I just wonder why all this while doesn't have this oil film until recent years.

My sand is fine sand, then i don't think is appropriate to use gyre anymore.

 

[Billdogg]

Film on the water surface tells me that you are lacking in surface agitation. The simplest solution is to angle a power head up to create turbulent flow at the surface. Good skimming will go a long way towards preventing it as well.