Hey toddnbecka! Thanks so much for the response! I greatly appreciate it. I looked at the reverse-flow replacement sponge suggestion you mentioned by searching them online, and that looks like a fantastic idea! I am definitely going to look into that and give it a try if they fit the openings.
Incidentally, I did put some foam on the overflow within the Proflex filter yesterday after seeing the cichlid fry in the bio-balls,.. though I wish I had seen the potential for this eventuality earlier and had put the foam in BEFORE the fish made it that far. When I cleaned the bags yesterday, there were also live fry in the bags, which were simple to remove and put in a secondary holding tank. But I will simply have to leave the others in amongst the bio-balls, until they are too big to hide, and then remove them unfortunately. The clearance inside my stand under the tank allows access, but not easy
access for the removal of the internal workings of the filter, and certainly does not allow me to chase tiny fish fry all over the filter with a net,.. especially when they dart around as fast as these one's do, lol.
One of the major disappointments for me with this very expensive ProFlex filter unit, is that fact that the wall between the initial intake and the bio-ball compartment does not lock in place. It simply leans against the compartment and rests on the top of the foam tray above the bio-balls. When water is being pumped in and out, there is enough suction created by the return pump to pull it up tight, but when you turn the pump off, if you go in and mess with the foam tray above the bio-balls, the wall tends to separate and will spill all the bio-balls into the first compartment. Not very well designed in my opinion. A simple lip behind the wall on the front and back glass of the unit would prevent this, but the designers obviously weren't able to foresee the problem in their own testing. Probably because they aren't testing them in the real world with real situations. Not at all worth the money in my opinion, and a big disappointment to me. Anyhow, that's for another discussion.
As for something to eat the fry,.. I have some pretty big Cichlids in the tank (they are the one's responsible for creating the fry in the first place, lol), and they do make attempts to eat them,.. but in the end it seems they just chase them into the filter. Ideally I'd have to find a way of blocking the corner overflows in the tank itself with sponges, but how to do that on a quarter-semi-circular overflow with nothing behind it to keep them in place, is something I am open to suggestions for too, lol. Or is that the overflow you are talking about when you said to put sponges on the overflows? If so, do you have any suggestions on how to do that so they stay in place? The overflow that I put the foam sponge on that I was talking about above, was the overflow within the filter unit. I just assumed that was the one you were talking about.
Thanks for the help though! I appreciate you taking the time!