my dovii has really %&*$ me off

[RLHam3]

get a canopy with a glass top and then put the light way up on top of the canopy?

 

[Experiment397]

one of my dempseys attacks the water that comes off the bio wheel on the filter when the water level goes low

 

[clayton1985]

i use to have this problem a few years back, not with quite such a large fish i should mention. the remedy was to cover the tank with polycarbonate, i attatched a latch system to hold it down but with a fish as large as a dovii i would use a wieght of some kind and thick poly (prob 8mm or higher if you can afford it) then use an arcadia overhead lighting system. that worked for me

 

[bigbaddad]

you could build yourself a wooden hood seal it and put some acrylic on the bottom of the hood if i can't break acrylic then neither can your fish.

 

[ccebr]

Cheers for all the suggestions
In the end I am leaving the tank top open, to stop the jumping altogether.
For lighting I have a 150W floodlight, looks very natural. Very Cheap too (< £10)