[1.12.2] Missing fluid texture

Hi,

I've been working on a custom fluid (no functionality at the moment), and am trying to get a basic texture implemented, it will only display the purple and black error texture.
If anyone can help with this issue that would be amazing.
I've had a look at several tutorials, but haven't got it working.

Github: https://github.com/Geoffry-Skionfinschii/IonicInnovations

plasma.json

{
	"forge_marker": 1,
	"defaults": {
		"model": "forge:fluid"
	},
	"variants": {
	"custom": {
				"fluid": "plasma"
			}
		}
}

FluidPlasma

package net.geoff.ionicinnovations.fluids;

import net.geoff.ionicinnovations.IonicInnovations;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fluids.Fluid;

public class FluidPlasma extends Fluid {

	public FluidPlasma() {
		super("plasma", new ResourceLocation(IonicInnovations.modID, "plasma_still"), new ResourceLocation(IonicInnovations.modID, "plasma_flow"));
		
		this.setLuminosity(15);
		this.setDensity(-1000);
		this.setTemperature(10000000);
		this.setGaseous(true);
	}
	
}

IonicFluids

package net.geoff.ionicinnovations.fluids;

import net.minecraftforge.fluids.FluidRegistry;

public class IonicFluids {
	
	
	public static final FluidPlasma FLUID_PLASMA = new FluidPlasma();
	
	static {
		FluidRegistry.enableUniversalBucket();
	}
	
	public static void registerFluids() {
		FluidRegistry.registerFluid(FLUID_PLASMA);
		FluidRegistry.addBucketForFluid(FLUID_PLASMA);
	}
	
}

Thanks for any help.