I had another idea to cover the overflow. I've seen little mesh hang in breeder tanks . They are basically a little cube surrounded by mesh. One of them might be a good size for the overflow box. I'll check around and let you know.
Well, I finally covered the overflow box. I used net material held in place with plastic cable ties. It isn't very pretty but it seems to be working great. See attached pictures. I hope that this is of some help
If anyone has comments on how to improve my design please let me know. Cheers and a happy and healthy new year!!!
I'm sure that it is a necessary prcaution because 2 of the mollies that I am using to cycle the tank ended up in the prefilter box outside of the tank. If they were swept in against their will then an Octo would likely find his/her way through the siphon tube.
I found that using netting to cover the overflow box can be quite an annoyance!!! It quickly becomes clogged and interferes with water flow plus it is a real pain to clean. I have hit upon another solution. I am goig to cover the top of the overflow box with acrylic with a hole cut out for the siphon tube. Thus, the water can still flow through the slots but a curious octo cannot enter the box and end up in the sump. (Hopefully) I'll post some pics of this solution if anyone is interested.
i am getting ready to do this to my hang on overflow box as well. i have some extra plexiglass at work.
but after looking at it again. i havent put water in this tank yet it appears if i put it in the highest position the glass top my sit nicely on top of it. any way i figure ive got at least 3 months to work it out. although i think i'm gonna oder a baby bimac in 2 months to go in a new 15 tall i recently set up untill the 37+10 is ready in another 2 months.
another thing..about the u tube. consider installing a air valve in the top of it so you would'nt have to remove it to get a siphon going. just attach air hose open valve and suck. hold your thumb over the hose and shut the valve.
this would probably allow a tighter fitting u tube!!!
In my opinion, covering the overflow box is an invitation for disaster. If the octopus can park itself in the U tube, then U have yourself a big problem as the sump keeps pumping water into the tank.
regular fiberglas window screening and a rubberband is usually suitable for any intake grille, but it will need to be brushed out periodically.
Plastic needlepoint grids sold at any arts & crafts store is a ceph keeper's best friend. A huge sheet costs a buck, and regular scissors can cut it. There are a million ways to fasten it to things, but I've yet to discover anything better than a dab of silicone.
Of course, if you just keep a bimac, there is no need to cover or screen anything.